Digital filter pressure gauge

You can use any standard water rated pressure gauge, most are male 1/4 inch NPT, the gauges sold to the pool market tend to be low quality and don't last but a couple of years I am sure you could spend hundreds if not thousands of dollars on digital gauges.

A quick ebay search found this potential one with the right general PSI range, etc. http://www.ebay.com/itm/New-Ashcroft-0- ... 41725aaae8

I assume it is water rated, but did not dig up the specs

this could likely be done with cheaper pressure switches
 
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