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You'll have to wire the compressor/s to a relay. Have a positive wire from the battery go to the constant side of the relay (87B terminal of the relay). You'll want to run a switched power wire to the pressure switch then to the switched side of the terminal (switched power wire connect to 86S terminal on relay). Appropriate ground is needed (terminal 85 on the relay), and ultimately power wire to the compressor/s (terminal 30H).

I recommend using the switched power wire (I used the wire off of the 12v power plug directly below the shifter) because if you have a leak, your compressor/s won't be turning on every time your pressure drops at the tank's pressure switch's cut in point. If you have your compressor/s pumping while the engine's not running, you're going to have a bad time.

Hope this helps!
 
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