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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 26 results

  • MS3Pro ULTIMATE Wiring Harness – Universal Flying Lead

    $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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  • MS3Pro ULTIMATE – Center (Black) Harness Only

    $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, intended for p...

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  • MS3Pro EVO with GM LS 24x Plug and Play Harness

    From: $1,749.00

    This COMPLETE package includes an MS3Pro EVO ECU, a 24X EVO/ ULTIMATE/ Drop On Harness  Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ul...

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  • MS3Pro EVO Wiring Harness – Universal Flying Lead

    $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 EVO with GM LS 58x Plug and Play Harness

    From: $1,749.00

    This COMPLETE package includes an MS3Pro EVO ECU and 58X EVO/ ULTIMATE Drop On Harness Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ult...

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  • MS3Pro ULTIMATE with GM LS 24x Plug and Play Harness

    From: $2,049.00

    This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 24X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...

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  • MS3Pro Plug and Play GM LS Alternator Lead Extension Harness

    $24.99

    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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  • MS3Pro ULTIMATE with GM LS 58x Plug and Play Harness

    From: $2,049.00

    This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 58X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...

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  • GM LS 24x Plug and Play Engine Harness – for MS3Pro Ultimate/Evo

    From: $799.00

    Designed for MS3Pro ULTIMATE plug and play installation.  HARNESS ONLY in this listing The MS3Pro 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 money while...

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  • GM LS 58x Plug and Play Engine Harness – for MS3Pro 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 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 money...

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

    $22.00

    If you have a previously installed MS3Pro harness (1st Gen) and want to change to an MS3Pro ULTIMATE or EVO ECU, the upgrade path is simple.  However, complete functionality will require a few basic changes to your 1st Gen harness. Our wiring upgrade ki...

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  • RacePak Universal CAN Interface Module

    From: $449.00

    The Universal CAN Interface Module for Racepak streams CAN-based data from your MS3Pro systems to any Racepak dash display for real time data viewing. The RacePak dash can read up to 20 data channels from the MS3Pro. Just plug it into the back of the ...

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  • MS3Pro EVO Uncrimped AMPSEAL Connectors

    $60.00

    Making your own harness? This plug and pin kit features the MS3-Pro AMPSEAL connectors plus 75 pins (so you'll have a couple extras) for making your own MS3-Pro EVO harness.  (or Gen1 if you wish) Download AMPSEAL Assembly Instructions

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  • MicroSquirt 30″ Pigtail Harness

    $84.00

    30" Universal harness and serial cable for MicroSquirt (sold separately).  This package includes all the wiring normally included with the Microsquirt on its own for customers who happen to need a spare or replacement harness.

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  • Wire – 2 Core Shielded 22 Gauge – 10′

    $14.00

    Wire - Twin Core Shielded 22 Gauge - 10' Shielded twin core 22 gauge wire helps cut out interference -- Perfect for Tach/Ignition Signal! This temperature resistant wire has two separate 22 gauge wires in the shield, making it perfect for variable relu...

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  • Wire – Single Core Shielded 20 Gauge – 10′

    $8.50

    Wire - Single Core Shielded 20 Gauge - Length = 10' Shielded single core 20 gauge wire helps cut out interference -- Perfect for Tach/Ignition Signal! This temperature resistant wire has one 20 gauge wires in the shield. Has many other uses where you n...

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