I have the configuration attached on my boat. The float switch turns on, and the pump runs, until the float switch turns off. This is 12v line and runs about 3-4amps. How do I wire in the digital input so I can see when the pump is ruining when not at the boat? People have stated I need a relay and/or optocoupler. But where would I wire this in, which relay, which octocouoler. I really can't seem to figure this out and need someone to explain it super simple :-) thank so you so much!