Originally Posted by THE BULL

Your best and easiest bet is to place this switch by the wiring of the pump.

A simple switch in the ground side of the pump will leave the power side of the wiring undisturbed. Placing the splice in the engine bay area is double the work + have to snake those wires inside of the car.
The pump wiring is inside the car already and routing the wires from the pump area to the center console or other areas will be a lot easier.

Good luck!