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They're in the early JDM cars, they removed them when the series 7 came out, cost saving measure I bet. Bypassing one in a car that has one would be easy, but wiring one into a car that doesn't have one would be a big task. My series 7 never had one, as said, they're basically always set to max brightness anyway, so wouldn't worry about not having one.
my 94 FD LHD with PEG has that panel light dimmer switch, which is powered off the 15A tail light fuse on my car......ask me how I found that out.......book wiring diagrams.