MS3Pro ULTIMATE adds nearly 50% more I/O with the addition of a third AMPSEAL 23-pin, 8′ flying lead.  Harness arrives with color-coded, printed wires per the pinout below (black center connector)

***Center Harness ONLY in this listing, intended for people upgrading from MS3Pro Evo with no other changes needed, or from MS3Pro Gen1 (which requires only a few changes to wiring on the white/grey connectors)