wiring in a c7501 60 gal Porter Cable compressor

I have installed a new compressor and have run 220 power to it and there is power at the pressure switch, but it won't fire up when I turn on the switch on the compressor. I am not sure that I attached the wires correctly to the pressure switch. Could anyone provide a photo or good description of how the wires should be attached to the switch? The manual is of no help. Thanks