Your switch setup will want 12+ ignition or 12+ constant depending on whether you want the ability to air down with the car off.
You'll need to run 12+ ignition power to the trunk, pass it through your pressure switch, and run it to the trigger pin on your compressor relay.
You'll also run a fused cable from the battery that's capable of handling 30A. This'll run to the power pin on your relay. The output pin will then feed the compressor power.
The VU4 just receives input from the switchbox, and then is grounded. It doesn't need power of its own.
You'll need to run 12+ ignition power to the trunk, pass it through your pressure switch, and run it to the trigger pin on your compressor relay.
You'll also run a fused cable from the battery that's capable of handling 30A. This'll run to the power pin on your relay. The output pin will then feed the compressor power.
The VU4 just receives input from the switchbox, and then is grounded. It doesn't need power of its own.
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