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When it works, it makes a fine tire minder if nothing else. Even if you don't use the traction related pressure drops, it still checks tire pressure and makes sure they're all at pressure upon startup. When it doesn't work, it destroys your tires without warning. I've had it on a several...

This rules out PPV completely.

How high is your pressure going?

Agree. Also, if you have horn, wipers, or tcase air then it also isn't the PPV.

A brief overview of the air system- Truck starts. Has no air. Begins building air. Pressure rises. When it hits 70psi or so, the PPV opens and "nonessential" equipment gets air. This includes wipers, horn, tcase, and air governor. At 120psi the expello valve on the air dryer sneezes, and...

Yes, but... Figure the last civvy owner may have gently driven it quite a bit.

Most likely it got new gauges at reset so what it shows is what's been put on it since reset. Not all engines were swapped. The data plate on driver side front of engine will tell you if so. The rust proofing by KS was unparalleled.

A KS RSMS truck. In my experience the KS RSMS group did a superior job reconditioning them. Contract cost was $65k per truck.

Also, I haven't had a pyrometer on an 8.3, but that sounds higher than I'd want to see. Insusoect someone tampered with the fuel settings.

My best guess says your PPV failed and your compressor isn't shutting off. You're hitting 150psi and hitting the pressure relief valve. The root cause is moisture in the system. Confirm my diagnosis and replace the PPV as a start....