Vin
Yes the switch is on when the servo switch is on. In my case the servo switch is controlled with a manual servo controller and left in an on position. The pressure switch will be on until it reaches pressure and switches off. (There is a small deadband pressure area.) The servo that controls the Eurokit valve then acts much like a pneumatic system. As soon as it switches over the pressure falls and the pump switches on until the set pressure is reached, raising or lowering the retracts. The pressure is held by the non return valve positioned on the supply to the valve before the branch to the pressure switch. (see my first photo).
I could always use a second channel to power up the pump rather than using the manual servo.
John