1970 wiring on 1972 fuse block

I have a 1970 challenger that came with a standard dash. I am using the original wiring except i am using a 1972 fuse block and instrument cluster wiring harness. Only gauge that works is voltage. I also can't get the brake lights to work. The tail lights work but not the brake lights. I have replaced the brake switch on the brake pedal.

What should be done when switching to a different fuse block?

Thanks for any help. I hate wiring/electrical problems more than anything.
Author: Old B5