[THEFERMANATOR]

The red plug was for 95 and older. The red plug was used at the engine end, and at the control box the wires normally hooked straight to the switch. Your older control box probably just had a short harness on it that was meant to be hooke directly to the engine's plug under the cowling. How does the harness hook up to the engine on your WELLCRAFT now? And the control is a standard style OMC control. The 96+ is known as the MWS style harness, or modular wiring system. It used deutsch connectors on all of the connections, no more screw type connections like the 95 and older. It looks like you cut the end off of your MWS harness for the ignition switch and butt connectored it to the red plug to hook up to the old style control, but retained the system check plug for the guage. You can use the MWWS harness you have and just wire it to an old style switch with ring terminals, and then string that red plug back to the 91 engine and hook it up direct. Follow me?