I tried a couple different options before settling on the center console.
This was my first location:
I first tried a momentary push button switch mounted in the shifter knob. Unfortunately, the switch needed to be held down for about two or three seconds, which was too much of a bother for me. So....I swapped in a flip switch (very similar to the one you'll see below in the final pic) and that worked well for a while.
After a period of time, I started having weird engine cutting out problems. The switch is wired to the ground wire of the PGM-FI module on my car, so it's killing the injectors within the cabin instead of going into the engine bay. After a few weeks, I realized that my switch must be the culprit. Turns out that the contacts had been broken slightly and resulted in a bad connection between the ground wire and the switch. Turns out that using hot glue to hold the switch in the shifter knob was a bad idea. Every time I grabbed the shifter knob, it was flexing those connections ever-so-slightly. Enough that over time, the connections went bad.
I decided to change the position of the switch to a more stationary position:
This works beautifully now. No bad connection and all I had to do was slide the switch in to a hole I drilled out. No glue or nothin'.
So, while I had a bad experience with a shifter knob-placed switch, you may have better luck with it.
