| http://www.w3.org/ns/prov#value | - Replace the pressure switch with a pressure sensor which can be read by a microcontroller such as an Arduino, decide whether/when to 'turn on' and operate a relay as required.The complexity is going up as you work down the list, but none of the solutions seem particularly difficult and the main issue I see is the practical issue of sourcing switches/sensors that fit your plumbing system.
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