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That's absolutely excellent that the system is mechanically solid and any method of control that gets it working to your liking is all that matters. My remaining concern is that we pretty much know for a FACT that you have wiring harness damage and we don't know where it's located - which...

Should. But they glued it. They are hard to remove in the best case with a 1/3 that number of wires. These are not coming out non-destructively.

The controller keeps throwing codes for the solenoid circuits - mostly the control solenoid but sometimes also the deflate and inflate solenoids. The pressure switch signal wire has 300 ohms of resistance to chassis ground even when unplugged on both ends. Did you check the wiring harness...