Fuel gauge reads too high.

[vince1]

Jeep cj5 tank, Equus gauge.

Before removing the gauge some months ago it was going all wonky flickering all over the place.

I put some grounds all over the truck, cab to frame, engine to frame, tank frame to truck frame.

Re-installed radio and fuel gauge. Radio works, fuel gauge reads high. With ignition off the gauge reads about 1/4. Full tank with ignition on it pegs out over full. Do you think it could be internally damaged or is there something else to check? Thanks.