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MegaSquirt 3X Wiring Bundle - 23"
MegaSquirt 3X Wiring Bundle - 23"
MegaSquirt 3X Wiring Bundle - 23"

MegaSquirt MS3X Wiring Bundle – 23″

5 out of 5 based on 1 customer rating
(1 customer review )
MegaSquirt MS3X Wiring Bundle - 23"



MegaSquirt MS3X Wiring Bundle – Length = 23″

  • ~23″ of TXL High temp automotive grade wire.
  • 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

Just like a short run of the MS3X harness, but with no DB37 connector.  We envisioned this being used to build short harness adapters to join your MS ECU to your stock wiring harness, either directly to the wiring (cut off the stock EC connector) or through the use of a DIYBOB or other means of adapting an OEM connector to build a short patch harness to allow you to plug your MS ECU right into your factory wiring.

We’ve custom printed these to include all the inputs and outputs on the expansion board. Use for making your own wiring harnesses, or for wiring up non-MegaSquirt systems as well. Includes wiring for sequential injection, sequential coil on plug, nitrous, boost control, and more.


Printed LabelWire GaugeBase ColorStripe Color
1MS3X-1: INJECTOR G20gaWhite-WHTDark blue-BLU
2GROUND – no printed label20gaBlack-BLKno stripe
3GROUND – no printed label20gaBlack-BLKno stripe
4MS3X-4: INJECTOR F20gaWhite-WHTDark green-GRN
5MS3X-5: FLEX FUEL INPUT20gaOrange-ORNno stripe
6MS3X-6: BOOST CONTROL20gaLight green-LTGRNRed-RED
8GROUND – no printed label20gaBlack-BLKno stripe
9MS3X-9: IDLE VALVE20gaLight green-LTGRNPink-PNK
10MS3X-10: INJECTOR D20gaWhite-WHTPink-PNK
12GROUND – no printed label20gaBlack-BLKno stripe
13MS3X-13: INJECTOR C20gaWhite-WHTLight green-LTGRN
14MS3X-14: SPARK A20gaYellow-YELno stripe
15MS3X-15: SPARK C20gaYellow-YELLight green-LTGRN
16MS3X-16: INJECTOR B20gaWhite-WHTOrange-ORN
17GROUND – no printed label20gaBlack-BLKno stripe
18MS3X-18: SPARK G20gaYellow-YELDark blue-BLU
19MS3X-19: INJECTOR A20gaWhite-WHTno stripe
20MS3X-20: INJECTOR H20gaWhite-WHTPurple-PUR
21MS3X-21: SPARE ADC20gaLight blue-LTBLUno stripe
22MS3X-22: EGO220gaLight blue-LTBLUDark blue-BLU
23MS3X-23: EXT_MAP20gaLight blue-LTBLURed-RED
24MS3X-24: NITROUS OUT 120gaLight green-LTGRNno stripe
25MS3X-25: NITROUS OUT 220gaLight green-LTGRNDark blue-BLU
26MS3X-26: TACH OUTPUT20gaLight green-LTGRNOrange-ORN
27MS3X-27: VVT20gaLight green-LTGRNDark green-GRN
29MS3X-29: NITROUS INPUT20gaGray-GRYDark blue-BLU
30MS3X-30: DATALOG INPUT20gaGray-GRYno stripe
31MS3X-31: PT4 LOGIC OUTPUT20gaPurple-PURno stripe
32MS3X-32: CAM INPUT20gaDark green-GRNno stripe
33MS3X-33: SPARK B20gaYellow-YELOrange-ORN
34MS3X-34: SPARK D20gaYellow-YELPink-PNK
35MS3X-35: SPARK E20gaYellow-YELRed-RED
36MS3X-36: SPARK F20gaYellow-YELDark green-GRN
37MS3X-37: SPARK H20gaYellow-YELPurple-PUR

Note that this bundle only includes the wires on the MS3X expansion board. Wire bundle for the MS3 main board is sold separately.

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1 review for MegaSquirt MS3X Wiring Bundle – 23″

    Only logged in customers who have purchased this product may write a review.

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

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

    Questions & Answers