I had made the mistake of hooking up an SR5 Dash without changing the oil pressure sensor and had no oil pressure reading. I changed over to the SR5 sending unit and went to Cal Mini Trucks and got another dash and it still has no oil pressure reading. I see 13.7V on the sensor. Is the sensor OK? What is the typical resistance of the sensor? Has anyone tested the gauge with a potentiometer on the sending unit wire?