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im thinking of purchasing an autometer electric pressure gauge,can i use this to check wi pressure, what pressure should it reach minimum and how and where in the water circiuit would i mount the pressure sender as the pressure sender is screw in type which screws into an alloy holder, the holder isthen normally jubilee clipped into the circuit, problem is the outlet and inlet of the holde are about 8mm diameter and all the wi lines are much smaller anything i can purchase that alloes me to fit the holder in