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Correct. I was referring to @GCecchetto's post for his A1R. Totally different gauge system. Same concerns about the 3126b oil pumps though. Same issues with the 3126b and the older C7's. CAT redesigned the pumps a couple times. And our application exposes that issue much sooner than say a...

The gauge itself is CANBUS to the MMDC so a low reading is not likely to be a connection issue since the signal is digital. I had nothing but problems with the pressure sensors and connectors so I replaced the engine wiring harness and in the process also found an injector wire rubbed through...

I replaced all of mine. But note that my truck was in Kuwait and El-Paso till late 2021 when I drove it home. Only 2,750 miles, but all three of my engine transducers have failed or thrown codes. It's worth the peace of mind to replace the 15 year old sensors - the boost pressure in particular...

Then something is broken. Probably the gauge considering it doesn't go to zero with power on/engine off. Test oil pressure with a mechanical shop gauge and then fix/replace whatever is broken with the stock system to get it reading correctly.

Does the gauge zero itself when powered on? Because 60-65 is not a likely correct reading based on what I've seen on a lot of other trucks. Usually between 20 and 40.

The off position isn't important as long as the gauge calibrates itself when you turn the ignition on. If it doesn't read zero with the ignition on and engine off then you need to investigate why. Start it up and let it get to full operating temp on high idle and once the fans cycle a few times...

It's going to change with temperature and RPM...... Under what circumstances is yours reading 70? If it always reads 70 under all conditions then something is wrong. That's probably a bad reading that's not reflecting reality. The general rule is 10 psi per 1,000 RPM at a minimum. Every...

It does sound like a connection problem. But the 3126 and C7 both do have oil pump issues and the pumps for them have gone through a couple design changes so I would find out why it's reading funky and why it's bouncing when it does read. Not something you want to kick down the road on the HEUI...

Year and model?