The float switches on my bilge pumps were built into the pumps. You secure the bilge pumps to the inside of the hull, on the bottom in the back and hook it up to the battery. The problem that I had was where to have the pump hose exit the hull. I had a local body shop drill a hole in the back of the skis, where I placed ferrule at the end of the pump hose. You gotta get that water out of the hull somehow. My pumps just sit in the bottom of the inside of hull and wait patiently for water that never comes. Two wires to the battery, one hose to the outside of the machines.