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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 29 results

  • MS3Pro ULTIMATE Complete Universal Flying Lead 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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  • 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 24x LS Plug and Play Harness w/ ECU-EVO

    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 Complete Universal Flying Lead 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 58x LS Plug and Play Harness w/ ECU-EVO

    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 24x LS Plug and Play Harness w/ ECU-ULTIMATE

    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 58x LS Plug and Play Harness w/ ECU-ULTIMATE

    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 – 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-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 8ft Wiring Harness

    $249.00

    MS3Pro 1st Gen Harness is discontinued and superseded by MS3Pro EVO. 8 foot (2.4 m) flying lead type harness for the MS3Pro. It has the MS3Pro's AMPSEAL connectors on one end and the other end is unterminated for installing your own connectors. This ha...

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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 Plug and Play GM LS 4L80E Transmission Control Subharness

    $279.00

    Harness Only.  Optional automatic transmission control using our MicroSquirt transmission controller (sold separately).  Literally, just plug in our transmission controller with the 4L80E subharness and  you’re ready to control your trans via CAN wi...

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  • MS3Pro Plug and Play GM LS 4L60E Transmission Control Subharness

    $279.00

    Optional automatic transmission control using our MicroSquirt transmission controller (sold separately).  Literally, just plug in our transmission controller with the 4L60E subharness and  you’re ready to control your trans via CAN with MS3Pro!

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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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