I have one mounted to the firewall on mine, you can see it on my recent post re: 235 aftermarket air breathers, it is mounted on the firewall passenger side, the off/on handle is mounted thru the carpet on the inside,, this part is hidden but I can reach it from the drivers seat,,I got mine from the local auto parts, paid about $20 but it is a nice heavy duty one,,I did have to buy one extra long cable because of where I have it mounted,,,regards,,Fred