MS3Pro Mini Wiring Harness Upgrade (Microsquirt to Mini)

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 kit 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