That is what I was going to say… I had to remove the ground, and reground my sending unit (Digital pressure gauge) for it to read properly. Mine is on at 110, off at 150 (always stops at 134 for some reason) and one day it said it was up to 175… so I let it go until it stopped, and then it dropped back to 134 when it was finished filling.
Make sure all of the wires have good connections.