ok. i am new to diesels. anyway my oil pressure was reading fine since i bought the truck. now as soon as i turn the key on the oil pressure guage pegs. I tried looking around under the hood but i dont see any lines going into the dash for an analog guage so i am guessing it is a digial guage. in this case where the hell is the sensor or oil pressure valve that might be stuck.. some assistance asap would help since this is my only working vehicle right now and i am supposed to go off roading in a couple hours.