MS3Pro Mini Wiring Harness Upgrade (Microsquirt to Mini)

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Easily upgrade your existing MicroSquirt harness for full MS3Pro Mini functionality If you’ve already installed a MicroSquirt harness and want to step up to the MS3Pro Mini, this k it makes the transition smooth and straightforward. While many connections are compatible between the two systems, full MS3Pro Mini functionality—such as sequential injection and additional ignition outputs—requires a few essential wiring updates. Our MS3Pro Mini Wiring Upgrade Kit includes 7 pre-crimped, color-coded leads that match the original harness layout for a clean and reliable installation. Just insert the new leads into your existing AMPSEAL connector to unlock additional I/O. Kit Includes: (5) Pre-pinned leads for Injectors C–G (2) Pre-pinned leads for Spark Outputs C & D Key Features: Designed specifically for upgrading a MicroSquirt harness to MS3Pro Mini Color-coded and pinned for direct insertion—no cutting or splicing Enables support for sequential fuel and additional coil-on-plug control Saves time and ensures a professional, factory-grade conversion Show more