Look into sprinkler valves, I think those are used quite often for this kind of application. If I remember correctly NItro used sprinkler valves.
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Second, is there a (cheap) way to attach a digital PSI sensor to the pneumatics? We would like to adjust the PSI output from the OI, but we aren't sure if we can.
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I'm sure you mean analog. If you find one, just shut the pump off at the desired pressure.