Oil pressure

What about the oil pressure sending unit? Is it one wire connector? If so, unplug the connector, key on, use a test lite and check for voltage, if nothing there, oil pressure gage isn't going to work. Whether the problem is wiring circuit-- gage--fuse somewhere, I don't know? If there is voltage, sometimes grounding that wire to engine block and the gage starts moving? If it reacts that way, then I think sending unit is faulty. The sending unit controls resistance to ground depending on the oil pressure. My wiring diagram for your model year isn't very good so I can't track the wiring circuit. What I posted is my opinion.