I installed Euro lights a couple of years ago, and finally got around to installing the vaccum adjust feature. It took a little less than an hour. In addition to the new headlight switch trim plate and adjustment dial (which I picked up used for cheap), cost was about $35 (for a bunch of vaccum tubing - hard and soft, 1 vaccum check valve, and misc. vaccum connectors from pep boys). It was a pretty easy install. It is a pretty cool feature. For anyone with Euros who hasn't done it yet, I would recommend it because it really is pretty easy. I used the directions in the 124 Owner's Bible.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car