Mike, Diesel911 is correct.

Additionally, if you have alot of oil present in the ignition vac lines, it might be a good idea to 'flush' it out before testing the new vac shut off unit ! Adding a clear fuel filter to the vac line at the vac shut off valve may allow you to see oil contamination from a future failing diaphragm before it gets messy.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD