well i just put in another 2.8 into my 87 berlinetta. the oil pressure needled goes straight to the top when started and stays there. i tried pluging it in the opposite way but i get the same thing. i think the sending units just pooched. how much do these cost? i know it's not the guage or the wiring cause it worked with the old motor. can't use the old one cause she got smashed up when i dragged her along the ground...whoops. oh well