when it rains it pours

Ok so while we're waiting for under hood wiring, Lets see what it looks like inside.
I would remove the instrument panel and at some point I would light it up and maybe even drive it without an instrument panel for a time.
The factory service manual is needed but.. their proceedures would have you work all around under the dash and leave the car disabled until its all back together. There is another way. been there done that a few times. A few of my gauge service customers have too.
And by the way... A member here has a dash wiring harness listed for parts only, priced right. It's from a 73 standard dash but would provide correct wire colors, etc.. to repair yours if needed. We wont know whats needed until we get in there.
Happy to help any way I can.