[Richard]

Here is a conceptual drawing of the setup fundamentals. The pressure switch must be downstream of the chk valve or pressure will release on the switch when the unloader unloads. The line to the unloader should not have pressure in it if the unloader is working correctly. I don’t know if you have the original setup with a powered unload solenoid, a retrofitted air compressor unloader switch, or something else. Simple test is with the compressor OFF, you should be able to blow air into the unload line.

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Oh my, last picture please. I have tried and tried but cannot delete the accidental pictures.

Anyhoo, that’s Alex our son and his bride. Yeah, I know, I marked him up pretty badly.