I have a cheap compressor (1.5hp, 10L receiver - branded "cosmo") that was bought a few years back for use with a nail gun. It mostly gets used for brad nailing, and with a blow head, and serves its purpose well enough.
One of the irritations with it however, is it does not auto switch based on receiver pressure - you have to turn it on and off manually. It's fitted with a crude bypass valve which basically "leaks" air once a preset pressure has been reached. This also has the implication that if you want an air supply at a particular pressure, then you have to run the receiver at that pressure as well, since there is no separate regulator for the output.
Fitting a secondary regulator would seem to be easy enough, but does anyone know where I can buy the type of switch gear fitted to most grown up compressors that I could retro fit to give full auto control?
(BTW this compressor does not have any special starting requirements that I am aware of - all the current switch gear does is switch the mains input to the motor)