MegaSquirt Wiring Bundle – Long
MegaSquirt Wiring Bundle – Long

MegaSquirt Wiring Bundle – Long

4 out of 5 based on 6 customer ratings
(6 customer reviews)


In stock

Product Description

MegaSquirt Wiring Bundle

  • 10′ TXL wire, color coded with labeling printed on the wire every 3 inches — no paper tags here!
  • IAC and Ignition wires are included for MS-I / MS-2 use (or MS-3 Primary Harness use)
  • Shielded Ignition input wire

Great for building up your own wiring harness, or wiring up your relay board where this will give you all of the color coded automotive grade wiring you’ll need to wire up the ECU side of the sensors (plus extra 20ga wire for sensor grounds), ignition components, and the ECU side of the injectors. For building your own harness on a car previously equipped with Electronic Fuel Injection, you’re good to go.  For wiring up a relay board you’ll just need the fuel pump wire, 12v supply wire to the injectors, and you’re good to go.

Our revised version adds some extra wires for CANBUS and replaces the single coax wire with a two core shielded wire for even better noise-free cam and crank signals.

Includes these wires:

QuantityWire ColorWire GaugeFunctionLabel
1Tan20Extra I/OMS 3 : SPR1 CAN-H
1Tan/Red20Extra I/OMS 4 : SPR2 CAN-L
1Tan/Green20Extra I/OMS 5 : SPR3
1Tan/Orange20Extra I/OMS 6 : SPR4
1Black/White20Sensor Ground
1Orange20Intake Air Temp SensorMS 20 : AIR TEMP
1Yellow20Coolant Temp SensorMS 21 : COOLANT TEMP
1Light Blue20TPS SensorMS 22 : TPS SIG
1Pink20O2 SensorMS 23 : O2 SIG
1Shield 2 White Conductor20Ignition Input Signal (Tach)White: CRANK CKP+ / RPM INPUT Black: CKP-
1Blue/White20IAC1A (MS-II)MS 25 : IAC1A
1Gray205v VREF (TPS, etc)MS 26 : 5V+ VREF
1Blue/Red20IAC1B (MS-II)MS 27 : IAC1B
1Red2012v+ Power to MS (switched)MS 28 : 12V+ SWITCHED
1Green/White20IAC2A (MS-II)MS 29 : IAC2A
1Light Green20Fast IDLE (FIDLE) Control (switched ground)MS 30 : PWM IDLE
1Green/Red20IAC2B (MS-II)MS 31 : IAC2B
2Blue20Injector Bank 1MS 32+33 : INJ BANK1
2Green20Injector Bank 2MS 34+35 : INJ BANK2
1Brown20Ignition Output (MS-II)MS 36 : SPARK A
1Purple20Fuel Pump Relay Control (switched ground)MS 37 : FUEL PUMP RELAY –

6 reviews for MegaSquirt Wiring Bundle – Long

  1. 5 out of 5


    I used this set to make a wiring harness without any extra wires in it. It worked amazing! I had no problem seeing the labels and if it was a dark color I just looked at a wiring diagram. overall these is a great product!

  2. 3 out of 5


    It would definitely be nice to get SOME sort of documentation as to what the wires are with this bundle. The wires are good quality, but the print doesn’t stand out especially well on the darker wires (you’ll want a flashlight or workbench with a light to help identify them).

  3. 5 out of 5


    I get 2 cars out of 1 bundle. Nice shielded wire for crank sensor.

  4. 2 out of 5


    I agree with Mr Jon Dresser. The bunble is helpful but it fails because my eyesite isn’t as good as it once was and colour coding is much easier to identify than the tiny and sometimes poorly ledgible writing on the wire.

    PLEASE READ THIS. A written list included with the wire bundle would help to identify the wires much more easily.

    It’s a shame that 10 guage wire for wiring up the earth and power to the relay board isnt included. I would’ve paid extra for this to be included. Same with the injector wires. In this case, I ended up with a whole bunch of left over wires and many I don’t have…

  5. 4 out of 5


    Very nice wiring bundle, but it would be nice to have a list of all the wires in the description here on the site.

  6. 5 out of 5


    This wiring is of high quality, it is going to allow me to wire the system properly, without multiple colours being joined and offers a quick and easy reference to which wire is which. A further advantage is that I can now locate the MS in a location not dictated by the original factory loom.

    Very much an advantage as my megasquirt install is in an off road vehicle, where it is not unknown for wires to need tracing due to mishaps!

    Ordered Friday pm, delivered to UK Tuesday 8am!

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Are you able to provide wiring with custom colors or labeling?

  • Sorry, we are not set up to custom print wiring at this time.