I took out the tank and sending unit when I had new pans welded in and the gauge hasnt worked right since. I have checked everything from the output of the sending unit to the ground connections for the sender and the gauge. When I filled up the tank it only indicated a half tank. Now as I drive, the gauge shows more fuel in the tank. I dont know if it is equalizing, going the wrong way or my firebird is producing gas as I drive.