The switch is sensitive to heat, is it in a hot area?
A quick way to test the switch functioning (but not the pressure to trigger) would be to put an ohm meter across the two terminals, in its normal state the resistance should be low to zero. Now disconnect the hose from the pressure reference - using a syringe with a plastic tip that fits the hose, put the tip in the hose so that it won't leak, start with the plunger pulled back and push the plunger forward. If the ohm meter goes infinite then the switch is working though as I said you still don't know at what pressure.
No to make sure your circuits are good connect the wires back to the switch, with the jet removed from the engine and in a container - do the same thing with the syringe in the hose this time with the ignition in the on position but the engine not running. You should get water flow as long as there is pressure on the switch - i.e. no leaks from the syringe.
BTW - what are you using as the pressure reference for your switch?
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