don't have a pic, but looks kinda like this - you should find the holes on the lower flange of the dash, right about center - will be screw holes on each side of a rectangular slot - it's not visible from a seated position, not on the front face ... vendor replacements I've seen are the modern toggle switches like you might find at a FLAPS

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics