I'm trying to get my oil pressure gage working. I replaced the sensor and wire between the sensor and the gage but still no reading. BTW I get no reading on the water temp either but I'm trying to solve one problem at a time. The wiring diagram shows a wire running from the sensor to one leg of the gage. The other leg of the gage is supposed to tie to one leg of the water temp gage and then the fuse panel. Instead, I have this device wired to the oil and water temp gage and then I assume the device goes back to the fuse panel (no easy way to confirm). Does anyone know what this device is?