Hey guys, I’m looking to build a tow behind spray trailer , to pull behind my vechile to spray grasses, am going to have a 12v electric pump, that I want to have automatically turning off when not moving, I have thought about running a wheel speed sensor of a car, but not sure how to covert the ac sensor of a wheel speed sensor to activate a relay, if you have any ideas on how I could do so, have a easier way to do so please reply, Jack squire