[steinra]

Make sure to look at the pneumatics section in the rules as it will help with the wiring question you have. But to help answer it, there is a pressure switch that is in the high side of the circuit that will change states when 120 PSI is hit. This single is passed to a digital input that you specify on the constructor in java for the compressor class.

I will let others talk to the rest of your question on if it can be done legally or not per the rules.

Randy