67 Barracuda Dash Dial lights

Check the dash lights fuse first....then most likely would be the variable dimmer switch built into the light switch. You can start by rotating the light switch knob back and forth a few dozen time to see if you can get any kind of flicker out of it. If not, you'll need to pull it out and see if it's cleanable/repairable or if you need to replace it. Check the interior light switch also before you pull it so you can clean that area at the same time. Some superfine sand paper and contact cleaner work good for that. They're pretty easy to find both used and new.