i tested the wires behind the gauge useing a test light.the white wire causes the test light to glow bright.i follow the white wire as far as i can testing it along the way until i lose sight of it or can't reach it anylonger,always getting a bright light. the tan wire however has a dim glow to it from the back of the gauge to the fuse box continuing to the sender. the only time i get a reaction from the gauge needle is when i use a jumper wire conecting one end to the sender stud the other end to the grnd wire just above the tank.then the needle reads just above empty say 1/8 of a tank.that can't be correct because i know for a fact there is at least 2/3 of a tank of fuel in there.