Checked and confirmed: Yes, the legitimate/good bulbs are dimmable.
this is the white one,
this is the amber one (I prefer these for max legibility with min glare) and
this is the red one (for red warning lights). Relatively expensive compared to stock filament bulbs or cheap generic LEDs, but you'll never have to replace them again and your dash light rheostat, wires, circuit board, etc will run nice and cool.
