LEDs. Since they don't disperse a really wide beam (like bulbs do) I found that I needed more than one and they had to point in various ways to get the Digital Climate Gauge + the Off/Econ/Rec + Vent/Fan symbols to all illuminate consistently. Also moded the pod and added an extra LED right behind the OFF label. Similar issue up behind the AUTO and DEFOGGER controls.
TwinturbineZ -- your approach to modifying the bulb sockets instead sure seems to be an easier way to do this. Nice thinking!!!!