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Wiring Harnesses & Wire Bundles

All MegaSquirt Wiring Harnesses use TXL high temperature automotive grade wiring/ wires are pre-printed with the ECU pin number and wire functions.

Showing 1–16 of 38 results

  • 8′ MegaSquirt Wiring Harness (MS1/MS2/MS3 Ready)

    $83.00

    MegaSquirt Wiring Harness - 8 Feet LongWe'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:...

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  • 8′ MegaSquirt Wiring Harness for MS3X

    $86.00

    MegaSquirt MS3X Wiring Harness - 8 feet8' of TXL High temp automotive grade wire. 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...

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  • MS3Pro EVO Universal Harness

    $249.00

    MS3Pro EVO Complete 8' Flying Lead Harness Only (White & Gray connectors with 8' pigtails) arrives with color-coded, printed wires per the pinout below.All applications. 

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  • MS3Pro ULTIMATE Universal Harness

    $299.00

    MS3Pro ULTIMATE Complete 8' Flying Lead Harness Only (White-Black-Gray connectors with 8' pigtails) arrives with color-coded, printed wires per the pinout below.All applications. 

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  • MicroSquirt Wiring Harness – 8ft

    $89.00

    Included is an 8' long harness for installing the MicroSquirt on larger vehicles instead of motorcycles and ATVs. Serial cable included.

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  • MS3Pro ULTIMATE Center Harness

    $49.00

    MS3Pro ULTIMATE adds nearly 50% more I/O with the addition of a third AMPSEAL 23-pin, 8' flying lead.  Harness arrives with color-coded, printed wires per the pinout below (black center connector)***Center Harness ONLY in this listing  ...

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  • MS3Pro EVO Uncrimped AMPSEAL Connectors

    $60.00

    Making your own harness? This plug and pin kit features the MS3Pro AMPSEAL white & gray connectors plus 75 pins- more than enough for making your own MS3Pro EVO or 1st Gen harness.MS3Pro ULTIMATE 3-connector AMPSEAL Kit available here

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  • MS3Pro ULTIMATE Uncrimped AMPSEAL Connectors

    $82.00

    Planning to make your own ULTIMATE harness? This plug and pin kit features the MS3Pro ULTIMATE AMPSEAL white, black & gray connectors, plus 100 pins- more than enough for making your own!(EVO/ 1st Gen 2-connector AMPSEAL Kit sold separately)

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  • MicroSquirt AMPSEAL Connector

    $35.00

    Planning to make your own MicroSquirt harness? This plug and pin kit features a 35 pin MicroSquirt connector and more than enough gold plated pins!

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  • MS3Pro 1st Gen Wiring Harness Upgrade (for ULTIMATE and EVO)

    $22.00

    If you have a previously installed MS3Pro harness (1st Gen flying lead or LS Drop On Harness) and want to upgrade to MS3Pro EVO or ULTIMATE ECU, the upgrade path is simple.  However, complete functionality will require a few basic changes to your 1st Ge...

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  • Seals-It Grommet – 0.75″ one piece

    $17.99

    Seals-It grommets make it easy to run wiring through your firewall without risking wearing the wiring, and help keep dirt and grime out of your interior. This one is a one piece, 0.75" inner diameter design that's perfect for any of our flying lead wiring...

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  • Seals-It Grommet – 1.00″ split

    $29.00

    Seals-It grommets make it easy to run wiring through your firewall without risking wearing the wiring, and help keep dirt and grime out of your interior. This one is a split 1.00" inner diameter design that can slip over our finished drop-on wiring harnes...

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  • MegaSquirt 3X Wiring Bundle – 8′ long

    $51.00

    MegaSquirt MS3X Wiring Bundle - Length = 8'8' 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 deviceJust ...

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  • MS3Pro LS Plug and Play Harness Alternator Lead Extension

    $25.00

    30" extension for GM LSx alternator subharness.  Our harness will require this if used with Camaro, Firebird, GTO, or CTS-V accessory drives. You can also use this with aftermarket brackets that move the alternator to a low mount position or relocate it ...

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  • GM LS 24x Plug and Play Engine Harness-ULTIMATE EVO

    From: $799.00

    For MS3Pro ULTIMATE/ EVO plug and play installation on GM LS engines with a 24x crank trigger.The MS3-Pro 24x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today.  Save your hard earned time and mone...

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  • GM LS 58x Plug and Play Engine Harness-ULTIMATE EVO

    From: $799.00

    For MS3Pro ULTIMATE/ EVO plug and play installation on GM LS engines with a 58x crank trigger.The MS3Pro 58x LSX Series Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today.  Save your hard earned time a...

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