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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
don't like 'em myself. would never consider fitting one. but as far as i know, they are self contained and just need power (and maybe another signal when your lights are on?) and the sensors inside measure the difference in light to dim as required.
it's the difference in shade between the door mirros and the interior one when you have someone behind that i don't like. it makes the distance seem different somehow. maybe after a while you get used to it.