Was thinking some sort of light box with some of the top missing, for build-up of any heat and to add a glow to the switch knob above it. The box could be tacked, even taped, to the rear of the dash fascia over the plastic insert and globe socket pressed in or similar during install each time. Just have to check brightness with rest of dash. But my dash needs redoing anyway so if it ever got that far it'd likely be forgotten completely or done differently.
