The truck has roughly 3k miles on it and has done this since it had roughly 800 miles. As soon as you turn battery switch on and then ignition switch the oil pressure gauge is pegged out. Ive unhooked the sending unit and its still pegged. Some days it will act normal but I'm thinking its stuck or went over the needle stops. Where do I get another one without having to go aftermarket I.e autometer etc. And the passenger side fuel tank always reads full even though its not.