Oil Pressure gauge troubleshooting help needed, Rallye gauge cluster.

[demo0211]

I have a Rallye gauge cluster in a 70 Cuda with all gauges working except oil pressure. Need help with what order is best to troubleshoot the problem. Sending unit bad, gauge cluster wiring, bad gauge? Thnaks for any help you can provide.

[Bullitt-]

Ground the wire that connects to the sending unit, that should peg the gauge. If it does your sending unit is the problem, if not the issue could be the gauge or wires or connections.

[demo0211]

Ok, thanks I'll try that and see what happens.

[MEK-Dangerfield]

I would like to see what your gauge looks like. They hang way low when they are blown. Look at the sending unit and see if it has oil leaking out of it. That clued me in on my car.   

[demo0211]

Here is a pic of my oil pressure gauge. Haven't tried grounding sending unit wire not ready to put all gauges back in car yet.

[MEK-Dangerfield]

The needle on your oil pressure gauge does look like it's hanging low. Same for the gas gauge needle, but I assume that gauge works?

[demo0211]

Yes, all gauges work except oil. Checked sending unit and there are no leaks.

[Grec]

MEK is right... It's usual for it to rest at the top of the "L", not the bottom. (Much like your temp gauge is doing)

Here's a good article on trouble shooting our type of gauges....

http://www.moparmusclemagazine.com/howto/mopp_0104_how_to_repair_and_diagnose_instrument_gauges/viewall.html

Good luck!