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1. It needs a special windshield glass (special coating).

2. Mounting is rather complicated as the whole thing is sunk into the dash behind the instrument cluster. Not many cars (if any at all) have enough empty space there to accommodate the hardware.

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Interesting, I guess it's more complicated than it sounds.

I wouldn't be surprised if many decades ago having a speedometer in a car was an expensive option. If HUDs catch on (and I hope they do), they'll become cheaper and who knows, maybe even standard equipment one day.

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