Orders containing MS3Pro ULTIMATE ECU’s will be briefly delayed; shipping is hopeful the first week of April. In brief, this is a supply issue created by a higher initial demand than we anticipated. We apologize for any inconvenience. MS3Pro ULTIMATE orders will be processed and shipping in the order they were received.


MS3Pro 1st Gen Wiring Harness Upgrade (for ULTIMATE)


In stock

Product Description

If you have a previously installed MS3Pro harness (1st Gen flying lead or LS Drop On Harness) and want to change to the MS3Pro 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.