Also don't forget to:
1. Put a check valve on the receiver inlet, otherwise the compressor is working against the compressed air in the receiver. Very important!!
2. A connection between the Pressure switch and the upstream side of the checkvalve to depressure the inlet line when the compressor stops. This is important for electric units as they will draw less load on startup and prevent the chance of burning out the electric motor. Most pressure switches have this sensing point and you should be able to buy a length of plastic tubing with appropriate olives and fittings when you buy the pressure switch.
