gas gauge

A while ago I removed and refurbished my 69 gas tank. Does anyone know if the ground wire is a resistor wire? I have a gas gauge that reads 1/4 past full due to a resistance problem back there. However I did not change anything in the original parts except the ground wire. The original was...

I ordered a new Spectra Premium Industries sending unit. I would like to test it before installing. Here is what i am thinking: - Ground the sending unit - Hook the sending unit up to the gas gauge - Power and ground to the gas gauge - Lift the arm of the sending unit Should that work...