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MS3Pro PNP Drop On Engine Harnesses

Available in 24x and 58x versions, The MS3Pro PNP Drop On Harnesses are professionally engineered and easy to install. Fire up your engine on day one! All wiring is composed of TechFlex woven, self-extinguishing wrapped hi-temp TXL & GXL automotive grade wire with OEM Delphi & TE connectors. Reach the battery under the hood or in the trunk with 4 gauge power & 10 gauge ground wires. All relays and fusing live in a single, waterproof fusebox and the fuel pump wiring / relay / fusing is big enough for pumps that can handle 1000whp or more right out of the box (10ga wire, 30amp circuit). Additionally, all of the available I/O of the MS3Pro are brought out in the harness to make expansion as easy as possible regardless of the featureset you’re planning to use, allowing for killer features like traction control, bump box, table switching, flex fuel, and more. This harness was designed with room to grow! And did we mention it’s show-quality-drop-dead-gorgeous?

This harness also is designed for optional automatic transmission control using our MicroSquirt transmission controller (sold separately). Literally just plug in our transmission controller using the proper sub-harness (for 4L60E or 4L80E) and you’re ready to control your trans!

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  • MS3Pro EVO GM LS 24x Plug and Play

    From: $1,749.00

    MS3Pro EVO GM LS 24x Plug and Play includes an MS3Pro EVO ECU, TunerStudio software and the most rugged & durable GM 24X custom harness.   Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3...

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  • MS3Pro EVO GM LS 58x Plug and Play

    From: $1,749.00

    MS3Pro EVO GM LS 58x Plug and Play includes an MS3Pro EVO ECU, TunerStudio software and the most rugged & durable GM 58X custom harness.   Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3...

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  • MS3Pro ULTIMATE GM LS 24x Plug and Play

    From: $2,049.00

    MS3Pro ULTIMATE GM LS 24x Plug and Play includes an MS3Pro ULTIMATE ECU, TunerStudio software and the most rugged & durable GM 24X custom harness available.  Experience the MS3Pro ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ulti...

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  • MS3Pro ULTIMATE GM LS 58x Plug and Play

    From: $2,049.00

    MS3Pro ULTIMATE GM LS 58x Plug and Play includes an MS3Pro ULTIMATE ECU, TunerStudio software and the most rugged & durable GM 58X custom harness available.  Experience the MS3Pro ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ulti...

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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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  • 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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  • MS3Pro ‘Drop On’ 24x LS Plug and Play Harness w/ ECU-1st Gen

    From: $1,699.00

    For MS3Pro 1st Gen plug and play installation on GM LS engines with a 24x crank trigger. 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 whil...

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  • MS3Pro ‘Drop On’ 58x LS Plug and Play Harness w/ ECU-1st Gen

    From: $1,699.00

    For MS3Pro 1st Gen 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 whil...

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  • MicroSquirt CAN Transmission Controller with 4L80E Subharness

    $499.00

    4L80E Plug and Play Transmission Control via MicroSquirt Seamlessly control your 4L80E transmission with MicroSquirt Transmission Control! The supplied 4L80E subharness provides a simple, plug and play integration with MS3Pro and directly mates with ...

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  • MicroSquirt CAN Transmission Controller with 4L60E Subharness

    $499.00

    4L60E Plug and Play Transmission Control via MicroSquirt Seamlessly control your 4L60E transmission with MicroSquirt Transmission Control! The supplied 4L60E subharness provides a simple, plug and play integration with MS3-Pro and directly mates with...

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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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  • MS3Pro LS 4L80E Trans 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 LS 4L60E Trans 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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