Changing gauge cluster light bulbs - How To

I can usually reach the bulbs without dropping anything. It takes more time figuringout how to get my hands up there but still much easier than removing the instrument cluster. Under dash a/c will make this a different story.
Use a lamp and if needed a mirror to get a good lookj first. Other than that its by feel. The bulbs are held in with 1/4 turn sockets. Over time they get brittle. :(
IIRC the bulbs are all 158 wedges base.

Yes. try your dimmer control first!

The 68 shop manual has an illustration of the instrument panel.