68 Dart damaged instrument cluster circuit board

Also, as a side note, my indicator globes/housings are missing... Would this maybe be because it's a GT model with front fender, top mounted indicator trim package
No.
GT has dash indicators also.
When you say "my indicator globes/housings are missing.."

Are you saying the light bulbs and the black plastic holders are missing?

If so, replacements can be had, just be sure you get the correct size black plastic holder. There is a small and a large and you need the large (IIRC)