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If it's there, the next check would be for continuity to the gauge wire. If there's continuity, then the two wires are indeed connected within the harness.

Thats where I was going too in my post.
If you look make sure you post it up. I have a mechanical guage in mine right now but it would be nice to install a elect back in there (less likly to loose oil in a failure) and have the light and buzzer as a backup. When you are wheeling, you can't watch that guage and wheel too. A buzzer in essance would save the motor.