Help with gas tank ground wiring (gas gauge troubleshooting)

[SailorChlud]

I second SSP Bill above, and will add that you should check the underside of the sending unit before screwing it in - mine had a small U-shaped metal piece (horizontal) that was where the float electrical connection was, and it had been bent in the factory so that the tops of the U were touching - giving me a false reading. It always read 1/4 full, until I separated the U wings and then it had the correct resistance.