[bayouwolf]

Check for frayed wires. I had the same problem with my Oil pressure gauge... I changed the sender unit, and it did'nt help. I started to pull the dash apart to remove the gauge and noticed a wire loom stuck in between the dash support brackets. Two of the wires inside were rubbed raw from countless hours of bouncing around. One of them was the wire from the sender unit. I respliced it and put a tie-wrap on the loom to move it up a little. No problems since. If you've got a continuity tester you can check for grounded wires without removing anything.