yeh, i was thinking of using a pressure regulator of some type, and/or a check valve with a high cracking pressure, returning back to the tank. but thought i'd give this a go insted. it isnt perfect but works and doesnt cost alot. the respose time seems to differ very little, than without the controller on it. almost instant. (with water in the line of course) found i didnt have to turn the pump speed down all that much to stop it hitting the presure switch, just a matter of setting it while the car was running, as the extra voltage from the alternator was enough to rase the pump speed.
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