houdel

Eric, I've got to go with Bjorn and Ken on this one. The OP guage on my truck are recieved from the DRMO was giving me all sorts of screwy readings. No oil pressure, normal oil pressure, peg at 120 PSI and stay there. On several occasions, with the truck not running and the accy switch off the guage would read 60 PSI and stay there for several hours with no power to the guage! Try and explain that!

I put a tee in the line at the OP sensor and ran a mechanical OP guage and got normal readings on the mechanical OP guage. I eventually got around to pulling my dash panel, wire brushed the grounding pins on all the guage mounting brackets (those grounding pins must be there for SOME reason) and thier respective grounding locations on the dash, applied copper filled anti sieze compound at all grounding points and reassembled. Started the truck, now the stock OP guage reads as it should, same readings as the mechanical OP guage!

I agree that from the WD, it would appear all you need is +24V and a good connection to the sender for the guage to work, but it ain't so. There must be some internal circuitry in the stock OP guage that requires an external ground for the guage to work properly. Now, if I can just get my fuel guage to read right ......