I put it on the shifter - I pulled the shifter stalk off the column, fabbed up a small bracket and welded it to it near the plastic handle, then installed the converter switch there, so it sits on the underside of the shifter lever and I can operate it with my thumb and my index finger when I put my hand on the shifter. I also moved my OD cancel button from the dash (I have a bricknose trucks) to the same location as the converter switch, only on the top side of the shifter lever, so I can again reach it easily with my thumb (had to extend the wiring on that by like 2ft tho). You have your OD cancel switch in the shifter handle already, so welding to the shifter may not be a very good idea, unless you find a way to pull the wiring out of it first, or weld in very small increments and fairly low amperage...