[n33k0]

Originally Posted by tdangle

The way to determine if it is the sending unit or the gauge itself is as follows:

1. disconnect the wire from the sending unit (typically a brown wire) it should read empty
2. ground the wire from the sending unit, the gauge should read full.

If this works, then it is the sending unit. If not then the gauge may have a problem.

Good Luck

Thanks for the tip, Terry. Reaching the sender will require dropping the tank; maybe I can take this opportunity to re-finish the bed wood and double check all the bed bolts. The tank does a great job making the farthest bed bolts impossible to reach.