I just installed a oil pressure gauge, its a Autometer gauge. I have it wired with the 3 wires you need. 1. ignition 2.ground 3.sender unit wire. proper fitting and hard ware are installed with tuner toys fittings. Here the problem when I turn the key on to acc. the gauge goes to 100 psi and stays there once engine is running. has anyone had this problem, or anyone help me out here. thanx.