the ideal set up is to use an external regulator. attach it in line with your gun at the compressor and set it to the pressure you want to spray with. then you compressor can run independently of the air pressure you want and will never fluxuate your spraying pressure. I have a moisture separator and air pressure regulator that I got from Harbor Freight that plugs right into my compressor's output connection, then the airline plugs into that. I set that at 30 PSI. and it keeps that pressure constant, no mater what the compressor is doing, because 30PSI is only about half of the compressor's low cut-in pressure.