Well I'm no expert but you have the same issue I had, the 02' IPC is serial data controlled as Is mine. When I hooked my 00 Camaro LS1 into my 04' Colorado, my gas gauge read backwards. My sending unit was 3 wires. Two hot wires and one ground, I swapped the 2 signal wires and it fixed my problem. I have also heard of people bending the floats to compensate for this, but I would not recommend that.
Serial 2 data wire requires input from BCM, messing with that is a real trick. Hopefully someone more professional will post something, BUMP BUMP!!


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