I'm not sure what happened, I am installing new tanks so I tested the new sending units to the gauge they worked perfect. I installed the new tanks with sending units and the gauge goes max full for both now so I un hooked tank ground wires no change, then I totally seperated the wire harness from the fire wall area that feeds the cab and they still read full really fast too. Puzzled what the heck has gone wrong no other work to wiring or any other work done.
