It was on bass pro shop web page its a question some one ask how does it wire and connect to my 12 volt system? this is the anwser that was posted It replaces the switch you have now.I drilled a 5/16 hole in my dash and took the wires off my switch and hooked them to the timer. hope this help major it dont sound to hard at all. but here is the link to it
Livewell Aerator Pump Timer - Marine - Bass Pro Shops