Oil Pressure Gauge Pegged

[ramluk]

Hey folks,

I'm working on restoring my factory gauge cluster (Had some aftermarket gauges from AutoZone, factory didn't work) and I can't seem to get my oil pressure gauge working. It's a 1985 k10 but with an 010 block. I bought and installed a oil pressure sending unit drivers side by the dist cap, and I have the boot wire that's tan but my gauge is pegged out. The wire in engine bay reads 12 volts with ignition on, but even when I ground the wire it's still pegged out.

So far I've replaced the circuit board, and the gauge. I'm suspecting the wiring at this point but just seems odd I'm getting 12 volts. Not a real knowledgeable guy when it comes to electric. My battery gauge works fine and I have the turn bulbs and backlights working. Seems like maybe it needs to be grounded, but you would think if I tried to ground it on the boot in the engine bay that it wouldn't stay pegged out.

Appreciate any help/troubleshooting tips!

 

[Jgonick]

If you used teflon tape on the sender- it might not be grounding. What happens if you ground the tan wire to a known good ground &/or where did you try to ground it before?

Check this video out. It explains how it works and how to figure out what is wrong.
Oil Pressure diag-LINK