[Richard]

John,

No problem just installing the compressor. You will have to ensure that you have a pressure switch AND and compression relief path.

That may already exist in the coach.

Or you can easily plumb your own. I apologize if I am telling you something that you already know. 
On the air line out of the compressor install a tee, one of the lines from the tee goes to the relief valve on the air compressor switch, the other line on the tee goes to a check valve, then is plumbed into the air pressure switch and the tank or system.