Thanks for reply...I will try to make more clear....the sending unit itself is grounded to the negative side of the battery. I was using one of the screws but now have it clamped to the gas pick up tube and continuity test shows it is grounded. In regards to the gauge cluster ...it is also grounded by a wire I attached to it and runs to negative bat terminal as well as the three screws that hold it in dash. The switch is wired to the empty side of gauge and the sending unit wire is attached to the full side. When I took the sending unit out of the tank it remained hooked up the same way. Out of the tank and moving the float up the gauge went to full...float down it went to empty. Did this 4 or 5 times. (Key on) .. I put sending unit back in tank..turned key on and gauge read half full which was correct. After taking the cluster out so many times and the gauge out seeking better ground I finally managed to fry the gauge so a new one has been ordered. I will move sending unit wire to frame...I guess I assumed neg battery post would work. I forgot to add the gauge would not go back to empty with key off
Last edited by papa ed; 02/10/2021 1:53 AM. Reason: With key off the gauge still shows half full
