I will join in, by pass all of the vac except brake and shutoff. Simple enough and should work. If it doesnt work then you have bigger issues (ie sucking oil into the vac pump). Rarely does the vac switch on the ignition fail.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42