[TBONE1964]

Hi Paul,

Maybe I can help. The gauge goes to overfull (3:00) when there is an open in the tan wire that comes from the sending unit or the sending unit is bad.

The thing to remember is the circuit works on the resistance of the ground signal through the sending unit. When the sending unit moves up and down it creates more or less ground resistance to the gauge.Because there is an open in the ground, the gauge thinks the sending unit is at no resistance and reads past full.

If you can get under and see where the gauge is, there are two studs. one is the hot from ignition and one is the ground to the sending unit. The one that is most near the center is the ground (tan wire) from the connector. What I would try is taking a new piece of wire and running it from that stud on the back of the gauge to the lug on the sending unit and see what happens.

If you are sure you have a good connection with a new piece of wire and there is good 12 volts from the ignition, then the gauge should read at the tank level. If it does not, I would suspect a bad sending unit.

I hope this is not to confusing and helps you,
Keep us posted,
Tom