It was given to me when I bought the car, an install the original owner never got around to doing. So, I'm not 100% sure what car it came from, all he said was he bought it in the UK? As for the dial, after doing some research I've concluded that the dial is used to adjust the lights up and down, if your car supports this feature, European option I believe. If not, then the switch will still work but, the dial will serve no purpose.
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