Hooking up a switch to turn it on and off will work, but you need to run it thru the governor so it won't engage when you are not moving. Otherwise, you will forget to shut off the switch and when you park it in reverse and back up, you will put it into first gear while you are still rolling. You will come to a sudden stop because it will not move backward if the OD is on and the trans is in a forward gear. You will end up breaking a lot of expensive OD parts. Trust me, I know this for a fact. Joe
