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Gauge Cluster issues,etc
I have a 2001 ram 2500 Cummins. Purchased it from others. It had an edge programmer wired in, but not powered up or connected to the OBD port. I took it off. My tach, oil pressure, and engine temp do not work. Speedometer works. Cluster lights work.
I find it odd the oil pressure gauge stays at zero, but the “CHECK GUAGES” light does not illuminate except during testing. No CEL. I’ve been going through wiring schematics. Checked all the grounds I could find.
The other thing that’s weird is my oil pressure sending unit just has 1 wire coming out of it. Grey w/Black stripe
Any help y’all can offer is much appreciated.