Hi - when the thread started, it mentioned the "new" self-dimming rear view mirrors - they really aren't THAT new, I had one in my 1959 Plymouth Sport Fury 2DHT. It worked really great. The only difference was it operated via a solenoid, so it made a noise when it dimmed. It was very responsive, though, and the sensitivity was adjustable.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C