2015 Prostar oil pressure gauge issues

I’m fairly certain I’ve got a wiring issue going on with my oil pressure gauge. Immediately upon key on gauge sweeps, but instead of returning to zero, it pegs at 6 o’clock, gives me warning light and beeps. I replaced the oil pressure sensor in the engine with no effect. No codes showing at all. Where do I start?

 

it’s an ISX. got good voltage at the sensor, I’m pretty sure its
Somewhere in the chassis side, just can’t seem to find the exact routing for how the oil pressure gauge is wired through the BCM to the cluster so I can follow all of that.

 

Good to know. I’ll look that direction a little more closely then.

 

Can anyone tell me what the voltage and resistance readings should be, on both sensor and harness side? I had it pulled up last night , and now my QuickServe won’t even show me the service manual or code lookup, so I can’t get links to the troubleshooting tree for this. It’s code 141 or SPN 100 FMI 4. Thanks in advance.