1965 Barracuda Formula S rear defroster

So the way I have seen them,

If it was non tach no a/c it was where the tach goes.
If it was tach it could be under radio
If it was tach a/c car it was under tach but out of way of e-brake

I would call Wildcat Autowrecking and see if they can help you.

The switch was the same from 64-66 same as convertible top in Valiants.