Was thinking about installing a boost gauge in my 1995 S-350 diesel and would like to know the best way to route the hose. I am kinda leary of drilling a hole through the firewall as good as Mercedes has the interior sealed off. Don't want a lot of air or road noise coming through. Any ideas??

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K