Download video: shoebox compressor clone 3000psi adjustable shutoff switch
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I took a bit of experimentation to find a spring that can work with such high pressures and i had to wait a month for a solid state relay to turn up but it is finally up and running.
the switch has been tested up to 4500psi and still had a bit of spring travel left but i am only going to 3000psi, and it shuts off at that pressure every time yay :-)