Thanks! I re-read the Bently's publishing W124 "Bible" and it says the MB spec is 13.7 psi for the 2.5 turbo boost pressure, so it looks like I am right on the money! These cars are sweet, especially with the rat's nest of uneccessary vacuum lines safely in the trash.

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1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter