Re: Need help with gauge wiring
My truck is a "brand C", and I couldn't find a GMC wiring diagram, so some of this is semi-guesswork. The dark green wire goes through the engine harness connector on the firewall, so start looking for it there, and then you can follow it to wherever it ends. If you can't identify the engine harness connector, look for the one that has wires going to the starter solenoid.
Ray
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