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Engineers! gotta have lights on the HVAC controls to see them in the dark but don't need a light on the light switch which turns
on the HVAC controls lights.
For the ashtray just use a standard 194 LED of your choice. Personally I use a 360 degree with 5 SMD chips on it.
You will need to remove the plastic shroud that kind of forces the light downwards. I just wedged my LED into the hole in the top of the ashtray that the shroud is supposed to clip to in a way that most is stuck through it.