Big-D,
Pulled out the headlite switch and did it there. There is only about 2 inches of wire to work with. I have not looked to see if the yellow wire runs up the left A pillar. If it does then you could put the switch there and mount it in the A pillar gauge mount if you have one. That is where I am going to put my switch. Since I already cut wires behind the headlite switch I won't cut the yellow again if it does go up the A pillar, just have longer wire to the toggle switch.