I agree... sticking anything on the A-pillar of a luxury car (or anything other than a rally car, really) looks ridiculous.
If you want to put a boost gauge on the car, I definitely recommend an ashtray one. On my 83 300D-T, I have the ashtray removed, and a boost gauge / volt meter installed.. with a piece of zebrano wood as the backing so that it looks "stock".
Not the best picture, but here's an example how it looks on my car:
http://s13.photobucket.com/albums/a281/Zerohour3k/?action=view¤t=CIMG0195.jpg
http://s13.photobucket.com/albums/a281/Zerohour3k/?action=view¤t=CIMG0196.jpg
http://s13.photobucket.com/albums/a281/Zerohour3k/?action=view¤t=CIMG0204.jpg
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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]
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