Can the "gear" selection lights (P-R,N,D,1,2,3) be changed?

Can the "gear" selection lights (P-R,N,D,1,2,3) be changed?
Not really. They are a fluorescent display. I suppose you could unsolder and replace it with another of the same, but that's it.

That's if yours are green. You didn't say what year truck (or even Hello:rolleyes:)

Welcome aboard;)