On to all the injectors. I pulled the wire harness out and check all my wiring. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. MegaSquirt MS3X Wiring Bundle – Length = 23″ ~23″ of TXL High temp automotive grade wire. ‘Optional’ MegaSquirt Relay Board – Assembled Unit. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. yes i was aware of the pin number being incorrect when i was installing the harness. Megasquirt 3 Wiring Help LM7 / LS1 / LS to a MS3 with MS3X (Megasquirt 3 with Expansion for sequential fuel injection). For an MS3 V3. Hardware manual covering specific wiring and configuration of your Megaquirt MS2/V357 ECU. ms3x box w/harness. 0, solder a 1K resistor to a length of wire and run it from the 5 volt point in the proto area to the TachSelect-VRIN jumper. 1. Add to cart. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. MegaSquirt MS3X Wiring Harness – 8 feet. 5 digital input/ output. See the Setting Up manual for more detail on version numbers. 99 DIYAutoTune MegaSquirt MS3X Wiring Harnesses Wiring Harness, MegaSquirt MS3X , 8 ft. I connected my "PWR" grounds from the LS1 coils to the engine block on a short run of wire to keep them out of the wire loom. That will be plenty for a stock boosted engine. It sounds like your saying I cant do that but just move the GREEN and RED wiring from my LED's to the ms3x expansion board itself. I am using a preassembled ms3x system with a 3. If that's the case how can I change the inputs; From what I understood I would just unhook the 2 ignition wires from the db37 harness and run it into my ms3x expansion harness under SPARK A and SPARK B. The BMW E36 is a masterpiece of attention to detail. We've got a pre-assembled MS3 with the MS3X extra board, and I believe it is a V3. You may have to register before you can post: click the register link above to proceed. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . At that. Hi All, I just recieved my MS3x and wiring harness yesterday, and have been looking for diagrams to use to wire it in to my car. COPs are from Toyota Highlander with 350 ohm input resistance. ( 14 questions) 5 out of 5 based on 8 customer ratings. 0 Hardware Guide. This manual contains a QuickStart Guide, installation, tuning and feature background information. Had a question about the signal ground to MS3 (Pin B) - I assume since the coil switching is coming from the MS3X board it would be better to ground to this rather than the main board ? MS3Pro Ultimate Standalone Engine Management System w/ Harness. 99. 3. Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods. 6 digital inputs. 5 Sensor. 5 out of 5 $ 114. We've packaged a DB37 male solder cup connector and a metalized plastic backshell for your MS3X builds. MS3X/V3. Ms3x Wiring Png. 5″ long (including the mounting ears), 4-5/8″ wide, and 2. To wire the fuel pump relay, connect pin 85 to the purple wire from the Megasquirt harness. Re: Megasquirt ON BMW m52 Engine. Hardware manual covering specific wiring and configuration of your Megaquirt MS3X/V30 ECU. 5″ tall including the mating connectors. harness side) when showing db37 pinout at all times. C4 Tech/Performance - MS3X wiring to 91 HEI7 and ECM harness - Can someone confirm the C3, C9 and D13 ECU pin out function names and wiring colors pls? Bentley and Chevy Thunder are not consistent when describing these three. 1. A typical installation on a VG30E would use the following parts: $692. I think I read some where that its all 20 gauge wire. Would 18 gauge be alright to run from the MS. So i could start to set the Tooth #1 Offset while cranking without sparks and a throttle body. 0 or V3. Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . Use a relay board and one of Mario's harnesses and you'll have a nice clean factory install. I am able to read a signal on the wire to the harness. comNeotech mega accordion harness Harness mega wiring ram 2006 cab dodge rear door mopar 2500 oem 2009Harness megasquirt 12ft. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. once the computer is hooked up to a 12v circuit it works just fine so thankfully I built it right. 8 logic level ignition outputs. nathaninwa Super MS/Extra'er Posts: 2628 Joined: Wed Sep 15, 2004. The genuine B&G partial kit with V3. Modding And Setting Up Megasquirt MS3X Remove Stock Wiring and ECU Modify Stock Wiring Mount The Megasquirt ECU Install CLT and IAT Sensors Wire The Megasquirt MS1/MS2 Harness Into The Car Wire The Megasquirt MS3/MS3-Pro Harness Into The Car Wire The ECU Panel, Wideband and Fuel Pump Reassemble The Engine Bay. 1. 5″ high. DIYAutoTune Wiring Harnesses MS3X-Hrn. Diyautotune harnesses. Powered up my MS3x 3. This terminal is also grounded to the engine block. pin 21 CLT signal. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. 8' MegaSquirt Wiring Harness (MS1/MS2/MS3 Ready) Add for $ 99. What sort of serial cable does it use? It uses the same DB9 to 2. 00 MSHarness: 8' main board wiring harness $86. 70 Subtotal without wideband . 2. C101 to X20 adapter is assuming you're removing the X20 from the E36 engine harness, and. 3. Shop Wiring Harnesses at Summit Racing. Megasquirt will support 2 separate injector channels, meaning I need to It seems like you could more accurately emulate. The signal output is going to come in at 8-10 volts from the GM module, so I need to build that circuit with a zener diode to bring it into the 0-5 volt spec for JS4 or JS5. Memories: '68 912, '72 911T, '80 911SC, '84 911,. These manuals contain wiring, fuel and ignition setup and board assembly details that are specific to your exact ECU version. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. 8′ MegaSquirt Wiring Harness for MS3X. Our USA-assembled map sensor uses a universal keying that is compatible with pigtails for 1, 2, and 3 bar MAP sensors. Note that the DIY Autotune wiring harness has a shielded wire – connect only the inner wire to this pin! Connect the E pin to pin 27. To start viewing messages, select the forum that you want to visit from the selection below. Install the firmware if. I currently have the recommended tach driver mods installed per MS2/Extra ignition description (which work). This manual covers MS3X/V3. GeorgePatches wrote: I actually found the answer on the megamanual website for the MS2. Powers all the injectors. 1 ecu that is the vanos motor. 3. 3 Wiring Harness The Megasquirt can be supplied with a "pigtail" wiring harness to form the basis of your own wiring. 99. 3) MS3 Cam Input (Dual VR v2. I pulled the wire harness out and check all my wiring. Will either of these things cause issues. For a V3. External Ignition Wiring. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. In this video the multiversal-timelines become intertwined, the editor screws up and shoulder pads! In all seriousness, I some wha. 3) MS3 Cam Input (Dual VR v2. . 5 out of 5 $ 114. Beyond the Ordinary: BMW Style with a 2J Twist November 14, 2023 Read More . I double checked my wiring and everything is still hooked up correctly. Description. 50. While this is generally OK for hall sensor use, our VR sensors output a far lower signal at low engine speeds and are far more susceptible to noise. 3. If someone with more experience could look over my setup I'd be ecstatic. You will also need to connect 330 ohm, 1/4 watt resistors from TPS VREF (pin 26) to both the low resolution signal and the high resolution signal to provide a pull-up in the wiring harness. 57 mainboard with MS3X as shown above running firmware MS3 1. 1998-2002 GM LS1 / LS6 Drive by Cable EFI Wiring Harness HAR-1012 LS1 Harness Instructions. 3. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. I did a MS3x install last winter and used DIY's 10' wiring harnesses. 57 with MS3X $99. I'm trying to avoid having a couple of fine wires needing to jump across from the MS3x harness to the MS3 harness. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! Use with MS3X Expansion board or other sequential device. 3) MS3 Cam Input (Dual VR v2. Ibrahim Nzioki On Twitter 2 Engine Harness Layout Since The Donor Was From An E36. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . Well, apparently I’m not too brave lol. Checking my COP wiring with my timing light, it seems that the coil output from MS3x needs to be wired in the following manner. MegaSquirt Wiring Harness - 8 Feet Long We've completely redesigned our wire harness to help you get your fuel injection installation right the first time with several new features to help make your installation as easy and reliable as possible:. ) How small or large this is depends on the current flowing and the resistance of the ground wires. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Would 18 gauge be alright to run from the MS. Connect the second shorter OEM 3-way connector to the matching LS coil connector with two brown wires. At least that's what the wiring diagram that came with it says. MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. Posts: 70. I have a m50 NON-Vanos motor with a Motronic 3. The spark wires might be custom or stock. Just to note, the motor will be turbo-charged, and I will use my MS3x to control box spark and fuel. 3. 00. Sounds as if that may have been an issue with a preproduction harness - the earlier ones used MS3 wiring as we didn't have the pre-printed wiring specific to the MS3-Pro yet. 3 high current digital/pwm outputs. 0, solder a 1K resistor to a length of wire and run it from the 5 volt point in the proto area to the TachSelect-VRIN jumper. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Starter is a new HiTorque unit. DIYAutoTune Wiring Harnesses MS3X-Hrn. I spent a lot of time determining wire gauge and connector type needed to safely carry the loads. Wiring Harness Adapter Guide For E30 M60 And Obd 1 M62 Swap Pinout A Cheap Way Of Getting X20 C101 Connectors Rts Your Total Bmw Enthusiast. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Would 18 gauge be alright to run from the MS. 02 with MS3x board on a v3. 8′ of TXL High temp automotive grade wire. by lastermann » Tue Dec 27, 2011 6:27 pm. I'm setting up my wiring for my Dodge Van with 5. These apply to the first generation MS3Pro, MS3Pro Ultimate, and MS3Pro EVO. The R pin is the HEI module’s tach output. 2. but also more difficult because there are way more wires and sensors in the engine wiring harness to connect to, especially the US. Since my MS3X is already installed and running my 1997 Vortec 350ci Truck, all I have to do is splice into the factory wiring for the signal hopefully this will. It sounds like your saying I cant do that but just move the GREEN and RED wiring from my LED's to the ms3x expansion board itself. SAYS IF HALL SENSOR. 0 mainboard. 3. Ms3x Wiring Png. Wire to pin 8 for 1G and 2G MS3X connector: pins 2, 3, 8, 12, 17 Wire with your grounds from the mainboard pin 4 Injector F output (cyl 6) Wire to pin 16 for 1G and 2GRe: MS3+MS3X and the EEC-IV adapter board Post by xrattiracer » Sun Mar 28, 2010 5:50 am what exactly would be the point of using a ms3x with the stock ford harness? you would have to add all sorts of extra wires for the extra functions anyway. I am opting to run sequential injection rather than bank-fire and will use an MSD box to fire the coil. The MS3 case is like a 2 1/2" high version of a regular V3. DB37 Solder Cup Connector for MS3X $ 8. Alot of time the shield wire of the crank wiring is left untouched, but it needs to be grounded. If you have any further information, contributions, or questions about this article, please contact us. The stock wires might work by just looping the extra length of wire-if you can picture that. 99. 99. This terminal is also grounded to the engine block. . Diyautotune harnesses. 0 MicroSquirt with 30″ Harness is an entry-level, fully assembled ECU and universal 30″ pigtail with varied applications targeting power sports, single cylinder all the way up to 8 cylinders. the Foxbody 550-937F kit is $1230 and i think the difference is connectors, but my connectors are not all the same anyway. MegaSquirt MS3X Wiring Bundle – Length = 23″. Terminal Type: Pin. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! Use with MS3X Expansion board or other sequential device. Add. Today's Posts; Member List; Calendar; Forum; E30 Classified Forums; For Sale & Wanted; Parts For Sale; If this is your first visit, be sure to check out the FAQ by clicking the link above. This MS3x Plug and Play setup offers much more than your standard EFI control. On the diagram, it shows only one wire coming for the harness, I assume the other wire will be the keyed positive. Using FIDLE and Idle will certainly be ok with the V3. jsimmons Experienced MS/Extra'er Posts: 207 Joined: Thu Jun 11, 2015 6:12 am. ( 8 customer reviews) $ 1,749. x Dated: 2015-06-03 Hardware manual covering specific wiring and configuration of your Megaquirt MS3X/V357 ECU. 050 on 114LSA cam sequential fuel and sequential spark LS3/LSA card MAF sensor 97 Mazda MX5 MS3 2002 vvt motor. 57 is an ECU based on Megasquirt-3 technology, consisting internally of an MS3 card and an MS3X expansion card installed on a surface mount V3. it's POSSIBLE the PO set it up in wasted spark (basically 1 wire will trigger cyl 1 and 4, the other 3 and 2) but that isn't likely if he's bought the harness from DIYPNP and I believe it has provisions for full sequential spark. Learn how to set up and tune your MS3X/V3. Would 18 gauge be alright to run from the MS. 5″ – much easier to incorporate into your projects than trying to use a V3. ModMotorMayhem. I need some advice from the group. 8′ MegaSquirt Wiring Harness for MS3X. 99. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. I am using the Megasquirt 3 with MS3X expansion. Pin 15 is the ground circuit for the coil packs and pin 45 is shielding for that circuit. 24″ of TXL High temp automotive grade wire. All wiring is automotive grade and the connector hood is metal. 1988 Porsche 911 Carrera. 8′ of TXL High temp automotive grade wire. HOWEVER when using the test page it seems that I am STILL not getting any spark signal from the. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Description. Would 18 gauge be alright to run from the MS. 4 coming shortly after this one. 8′ MegaSquirt Wiring Harness for MS3X. I've gotten the truck running great and was pleasantly surprised with the motors performance. 12′ MegaSquirt Wiring Harness (MS1 / MS2 Ready) and possibly the MS3X Harness as well if you’re running the MS3X board. 1. MegaSquirt MS3X Wiring Bundle - Length = 23" ~23" of TXL High temp automotive grade wire. 99 Quantity Add to cart MegaSquirt MS3X Wiring Harness – 8 feet 8′ of TXL High temp automotive grade wire. Any help would be appreciated. ect , and have all my wiring as per schematics on MS site. $79. To access the remaining two connectors on the wiring harness you need to move over to the driver side and discconect them. 8′ MegaSquirt Wiring Harness for MS3X. I've already searched the archives and was unable to located anything beyond 1982. . Is it using it's own pattern if the cam signal is not presant. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. 1-8 Spark 1-8 Cam Nitrous 1 (Line Lock) Nitrous 2 (Trans Brake) Boost (Boost Solenoid) EXT_Map (LS9 Map Sensor). 57 main board, MS3 daughter card, MS3X, and all the other associated parts. 99. Add to cart. 2 dedicated spark outputs. 00 38NPT-Bung_A: Aluminum bung for IAT sensor (Also available in stainless steel) $6. The explanation in the manual states that sometimes a coil is necessary. 2) MS3 Sensor Ground PIN 7 Not connected at this time since no TPS, IAT, Coolant, O2's are connected. SAYS IF HALL SENSOR. 0 Hardware Guide 2. I am installing a 1997 Ford Explorer 5. For those wanting a complete, ready-to-go setup with harness, calibrations, etc then look at the. 6 with itbs & ms3x into g50 carrera – the story so far MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. 1 Best Practices. Part Number: BEC1800715. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. 2. You may have to register before you can post: click the register link above to proceed. Dated: Hardware manual covering specific wiring and 3. 3. my components are a turbo ABA vw using factory crank trigger and a single. . 99. JamesMS3Pro Ultimate Configurable Inputs/ Outputs: 10 channel 4:1 or 8:2 programmable peak and hold injector outputs. 0 mainboard. Also i a using the newest firmware on the ms3x, I believe it is 1. Re: MS3 wiring harness colours - standardisation. Found it relatively cheaply at 4K. 1987 Supra - 2JZ-GE NA-T MS3 + MS3X Wiring Check. $23. SAYS IF HALL SENSOR. A main step in your MS3 Gold Box installation is connecting up the wiring. x card will need to be able to manage a 1992 f150 4wd 351w with MAP efi? also i see diyauto tune sells wires for the ms wiring harness that is 20 gauge. 5 4. On the MS3X expansion board, R11 adjusts the threshold voltage, and R32 adjusts the hysteresis level. 3) MS3 Cam Input (Dual VR v2. 99. 00. Where is this harness manufactured? It is assembled in the USA. 00. 5 out of 5 $ 114. 00. I'm less clear on whether its important to run the ground from MS to the engine (and thus back to the battery) or if I can simply take them to the battery via a nearby distribution block. I beleive it is 10G wiring to the controller (18g pwm wire) and 12-14G out to each fan. Build the ECU up to trigger from the VR Input. 7 Tuning interface; 3: Wiring. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! Use with MS3X Expansion. I also have a Mustang 91 with T5 transmission and would like to use traction control feature. MS3 Pro Plug and Play for 04-05 Mazda Miata Mazdaspeed Miata. Does the DIY MS3 wiring harness have wires populated for these pins? (Pins 5-6 on the MS3 output). Color coded wiring with labeling printed on the wire every. There are 3 or 4 MS side harnesses that are about 14" long, they all come from the MS3X pigtails and go to those gray multiplugs. Then I checked from the bulkhead to the Ms, that was good. 3) MS3 Cam Input (Dual VR v2. 1L Hemi along with the engine wiring harness off of Craigslist. 0) or a 93-95 325i (E36, Motronic 3. . MS3/x ground wiring. Add to cart. Now to remove the grommet you'll need to use a flat head screw driver from the engine bay and pop it out. RX7 Series 2 13B Turbo. NB2 cars have the most straight forward installation. Reviews . 00. 99. 0: Solder a 1K resistor to a length of wire and connect it from TachSelect to S5. Description. Pins 6, 28, 34 and 55 on the harness side go straight to Earth ground. 6 conversion. Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37. If I am using an MS3 with MS3X, do I use this harness or the MS3X harness? The MS3 with MS3X has two DB37 connectors, each of which use a harness. 3. The crank sensor shield is also listed as Pin #2, but that just seems to be another ground wire on my harness that was routed out towards the sensors. Built a Megasquirt Computer to handle spark and ignition. All wires are color coded and printed with their functions. View Profile View Forum Posts. SE EFI Installation Manual. Would 18 gauge be alright to run from the MS. MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. The wiring diagram looks very nice. 82 - 83 280zx Turbo distributor wiring plug. B1 (Relay Ground for Fan) 12v Switch 5vRef Grounds Dedicated Ground MS3X Board: Inj. x (See the Setting Up manual for more detail on version numbers. -. 3. But my big brain figured to follow MS3x directions and redo the wiring harness. Just like the MS3X harness, but with no DB37 connector. I connected the "signal" grounds to the terminal where I ground all of the megasquirt grounds. Also i a using the newest firmware on the ms3x, I believe it is 1. and so on. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37. Распиновка разъемов C101 на X20 Bmw 3 Series 2 5 л 1987 года Drive2. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . Use this high quality MS3X wiring harness to take advantage of all the great features on the MS3X expansion board. 2. MegaSquirt 3 ECU with MS3X Expansion. 00 MS3X-Hrn: 8' MS3X wiring harness $22. 24″ MegaSquirt Pigtail MS3X Harness $ 79. The MSD box says to wire the Violet(+) and Green(-) to the power and ground on the distributor. Last edited by maxott1; 12-30-2011 at 04:40 PM. 8′ MegaSquirt Wiring Harness for MS3X. 5 out of 5. 1. to the Megasquirt. ~23″ of TXL High temp automotive grade wire. MS3 w/code 1. Get a Quote. Anyone onto the questions. Add to cart I use an MS3x for a completely custom vehicle (engine is a 2. I probed the wiring harness and had continuity between pin 2 and the corresponding pin on the VR connector, so the screen appears to be connected. x Does not apply to other Megasquirt products. C1, and B1 body harness connectors to get power and the auxiliaries working. MS3X/V3. MS3x Wiring Questions. Built a Megasquirt Computer to handle spark and ignition. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. It ought to work with a modded V3. More expensive standalone systems also. Run this resistor-on-a-wire from the 5 volt terminal in the proto area to the same input pin (SPR1 or PAD7) used in the previous step. Traction Control. Hey Everyone. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. 05-19-2017, 03:45 PM. And used MS harness wire #30 to control the IAC valve. Obd1 and OBD2 cam sensors are 3 wire but the plugs are inverted male and female from obd1 to obd2. There is a recall on us crankps and they sell a wiring harness kit with it. MS3 code uses a somewhat different wiring pattern for the MS3X outputs. Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods. 1) MS3 Main board 15-19 grounds connected to engine block, MS3X wire harness not connected at this time. Add to cart. MegaSquirt MS3X Wiring Harness – 8 feet 8′ of TXL High temp automotive grade wire. MegaSquirt MS3X Wiring Harness - 8 feet 8' of TXL High temp automotive grade wire. This 8′ wire with pre-crimped terminal can be poked into our MegaSquirt DB37 harness if an extra wire is needed for additional I/O (MSHarness12, available separately). This is the latest top of the range MegaSquirt ECU – the MegaSquirt 3 (MS3)! This controller is jam-packed with features found on aftermarket engine controllers costing 10X as much, yet is easy to use and configure!. Color coded wiring with labeling printed on the wire every 6 inches -- no paper tags here! All wiring is pre-crimped (NOT solder cupped!) to the DB37 Heavy d. Because of this, we need to replace the unshielded wire with two conductor shielded. 1 PWM IAC output – can be repurposed as. Would 18 gauge be alright to run from the MS. I even pulled the Ms out and made sure the jumper was installed for the cam input. Posts: 70. Re: Megasquirt ON BMW m52 Engine. i will update this as frequent as i have questions which im sure will be alot due to this being my first car ill be wiring up myself. I have a couple questions I have some resistors to be able to run TFI as well as the ms3x card so I can easily run my PWM IAC and my A/C. 00. 99 DIYAutoTune MegaSquirt MS3X Wiring Harnesses Wiring Harness, MegaSquirt MS3X , 8 ft. Connect the camshaft position sensor to pin 32 of the MS3X DB37 connector. 1A) internally wired to MS3 Main Connector 27 IAC1B Blue/Red . MegaSquirt MS3X Wiring Bundle – Length = 8′.