If air is moving through the hose no pressure will build up, and you'll burn out the compressor if just stays on. With the ARB they should have a pressure switch that plugs into a T fitting or the tank. That pressure switch should be installed in-between the "On" switch and the Switch position of the relay/solenoid that provides power to the compressor. As long as the switch is in the air stream once it gets to the max pressure it disconnects the power automatically, then once it drops below the minimum reconnects the power. If you follow the instructions provided you should be just fine. If you have a compressor without the harness then you need a relay and a switch at the minimum and if its not with the compressor you'll need a pressure switch like this one
If your new to wiring then take the time to ask a lot of questions and get it right the first time. Vehicle fires suck
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There are a lot of people on here that know more than me, but I'll answer any questions you have. We all had to start somewhere but I know I would have been a lot better off if I had resources like these when I started out.