I must have bumped something when I was doing the engine conversion. My fuel gauge is showing full when I turn the key on. I know I have less thank a half tank. I suspect the ground but have no idea where it is at on the tank. This is a tank that has the two wires on the pickup, one for the fuel gauge and one for the low fuel warning light. 91 Santana 2500 wich had the original 2.5NAS Diesel converted to GM inline 6.