Thanks for clarifying, everybody. The oscillating thing makes sense, was just wondering because the jeep I mentioned doest do it.
The color of the needles fading also makes sense, but I was curious because on my truck the battery gauge is the only one that decided to fade (out of the four small ones), the other ones are holding the color very well.
I will add the led cluster lighting upgrade to my list. Are the T10 wedges plug and play?