[tdangle]

Originally Posted by rpmerf

It goes back and forth between the 'expected' reading and maximum hot?

If you pull the connector off and touch it to ground, does it read full hot? Wondering if there is a short to ground somewhere.

Exactly. Yes if I ground the wire it goes full hot. Also wired in a 100 ohm resistance to ground and it reads exactly where it should. Wiggled and pounded on everything I could find and the gauge never moved. I have also tried 2 new sending units. The only thing that makes any sense is some sort of steam pocket but I've never run across this before.