I found the switch I used the first time at a radio shack for about $3. It has since been repurposed for use in my grid charger as the switch between charging, discharging, and just running the cooling fan - I took it apart and modified it so it isn't a momentary anymore. I now use Daox's 3d-printed shift knob instead.
http://ecomodder.com/forum/showthrea...ons-31991.html