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The switch goes to ground in the digital port, and to one of the switch inputs.
The Spike can only be turned on via its "PWM" cable input, which applies a current to a LED in the spike. The ground for this is the black wire terminal. Just connect the Spike to the RC output - don't wire it to the pressure switch.
The compressor's wires go to the Spike. The Spike needs power from 12V to run itself and its LED. It, not the compressor, should be taken to a breaker and a ground terminal.
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