altitude hold button
I think an ebay search for a lighted push button switch would work. I got one two years ago. Green push button.... about a half inch across. It lights up bright enough for day use.... Sorry, can't remember the vendor name.
"Kindness is never a bad plan."
Work bio: Avionics tech support; ATP rated in planes.Helicopter rated, balloon instructor, seaplanes and for grins, Phantom Drone pilot. Instructor for air medical and law enforcement tactical radio systems. Fly my RV9A to work every week. Janitor when and as needed.