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The pressurised system is very easy.
On your current set-up, the taps are simply turning the pump on/off, but all this is simply done by the pressure switch being inline between your 12v and the pump inlet.
You should already have a negative (-) supply at the pump as generally the positive switching will be done via the taps micro-switches. You'll need to provide a positive (+) supply to where you want to install the pressure switch; you could simply remove the two wires from the sink tap and join together (disconnect and insulate the wiring from other tap too); this will provide a permanent 12v at the pump inlet, so disconnect this wire from housing and use this as your +12v to pressure switch.
The drawing I've posted is crude (knocked up quickly), but fundamentally illustrates what you need to achieve regarding wiring. I would assume there's already a fuse in the circuit (check first), in which case this isn't difficult at all and the only other hardware needed is the switch itself and a surge damper.
Bear in mind that the pressure switch needs adjusting for proper operation, and you need to ensure your system is leak free i.e., all inlet seals in place, inlet in good condition etc.
The only "fly in the ointment" could be the taps though. If these have any wear to the seals, they could potentially be unsuitable for use with a pressure system. With a switched system, you're less likely to be aware of any seal failure as the pump is turned off by the taps micro-switches directly. However on the pressured system, as this is controlled via the pressure switch itself, any leak will trigger the switch and the pump will run.
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Paul
Every day's a school day!
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Topic: changing to pressure water system
