EasyJake is a Switch made by a Trucker 4 Truckers. It's a Handy On/Off switch to Flip that fits with Eaton Fuller Shift Knobs an speed it is design for pinky figure flip, EasyJake can be used many different ways the switch hole in the EasyJake is universal can be used for many different ways than we sell. We use it for our Engine Brakes other fogs/moose lights, pretty much what ever you feel like flipping on/off al lot. Easy to Install, it is just an interrupter switch. Replace old shift skirt with EasyJake shift skirt. (fits on all Eaton fuller Shift knobs fro the 70's to present Day Any Speed Eaton Fuller Shift Knob) Run 10 ft UV Protectant Wrapped Wire to the EasyJake skirt on shift knob. Next use the heat shrink female connectors to the switch then slide the switch into place. Now find the wires on the back side of the Engine Brake switch, (can be up to 8 wires on that switch) next you take a Test light and find the switch that turns On/Off when you flip your Engine Brake Switch. (if reverse polarity connect normally Negative ground wire on test light to a Hot wire instead of Negative wire, this helps you find the Negative in Reveres polarity) Once you find the one single Wire that goes Hot/Cold once you flip your Engine Brake On/Off, you the interrupt that one wire. Now for Lighted Switches all you do is ground out the single wire to the truck somewhere. (if reverse polarity find hot wire, to get the light to work).