i bought mine used .. came with the pressure switch. It arrived in dec 2014 and is still working well. 25 fills, though my tank is only a 2500psi steel one.
i did get a guppy tank and filled it. the cutoff shut off right at 4500 psi according to the gauge on the guppy. i would still sit near it and not bank on the switch cutting off every time.
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