great info guys thanks.
The square hole in the pic is for the rear defroster switch.
I finished up the dash and console install today and.... what a difference a simple clean and repaint makes to the interior! I looks like a whole different car!
I took the project as an opportunity to clean up some hacked wiring back there. I even got the original radio/cassette player to fire up. The radio needs a new power switch, and the power antenna isn't going up but other than that its all cleaned up. Ive got two new front speakers on the way, and Ill troubleshoot the antenna later. Not sure what Ill do bout the power button. I have to hold it in. It wont click in, click out like it should. Fun project anyhow for a rainy day..
The interior lamps ran the battery pretty low while I worked on it. I got some funny readings on my oil pressure and voltage gages when I started it up, which seemed to clear up once the engine got hot and I had driven it around the block. if low V wasn't the cause, I might have to pull the dash cluster again and have a look at the circuit sheet again.
anyhow, now that I am out of that dash/console repaint rabbithole, Its back to the Ttop repair. I think my next step is body filler.......