wiring my compressors

[62scraper]

I want to wire two compressors with a pressure switch and a toggle switch in the cab so that I can turn them off when I am not driving the truck. Do I run a wire from the battery to a ciruit breaker and then run a wire to each compressor and then run a wire to a toggle and then to the pressure switch and then to the circuit breaker? Are relays and circuit breakers the same thing? Should I put a fuse somewhere and what size? Should the power to the toggle come from a source that is constant or only when the ignition is on? I want to do this right the first time and any help is greatly appreciated.