Description

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 Gen harness.  Our wiring upgrade kit contains the 8 pre-pinned, color-matched wire leads to make your conversion a snap!

*NOTE- For LS Drop On Harnesses, WHITE CONNECTOR pins 15 & 27 are NOT POPULATED.