The Rule are a good pump, but best coupled with an ECO air press sensitive type auto switch as opposed to the Rule float switch.
I have a rule in the lowest part of the bilge wired through aforementioned switch, and a large pump fitted aft but with the suction hose picking up from the lowest point in bilge too and for setting the big pump to auto I also use the same ECO switch, but with an isolater switch between the ECO switch and the big pump supply which means I can have either or both pumps on automatic from the one ECO switchThe ECO switch can be sited outwith the bilge area ensuring it is always dry and clean.