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The digital pressure switch is what goes into the digital input to control the pressure. It has to be able to shut off at 120 psi.
You can't have 2 different pressures feeding the same cylinder.
I'm not sure which KOP pressure switches have set screws and are uncalibrated. The relief valve, which vents excess pressure, doesn't have a set screw, but may come uncalibrated. One of the hex rings loosens the switch, another does the actual adjustment, and the last is rigid for fitting the valve onto the compressor or fitting.
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