The air pressure switch on most Haas machines is located on top of the spindle head. It is under the cover, and exact location depends on the year of machine.
The regulator should be set to 85 Psi and have a minimum of 100 psi line pressure from the compressor.
The pressure switch locate on the back air/ oil panel , near the oil tank is the lube line pressure switch.
The black solenoid hooked to the regulator is not the pressure switch.
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