[mcmlxix]

You can locate it below the wiper switch. I believe there is a hole in the metal part of the dash behind the gauge cluster bezel. My 72 Blazer had a manual choke there. You could use the space for a fog light switch and it would probably come off as something GM might have done depending on the style of switch.
If you find a rotary switch and get a spare knob from a headlight switch you would be good to go...