Speaking of the overpressure sensor, specifically this one: http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23O0HOZY623O0HP54S&year=1993&make=MB&model=400-E-001&category=R&part=A%2FC+Pressure+Switch, will it protect a system (compressor) if the a/c is ever overserviced. I guess 30 bar is about 435 PSI, so maybe that's too much for an old compressor to handle before it blows out.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles