That is way smart!

Do you have to use a gasser gauge from a same year car or are all the W126 years the same in this regard? I'm thinking about all the connectors on the back.

Also, I have a KKK turbo on my 1983 300SD - the archives seem to suggest that boost adjustment is much easier than on the Garrett - any thoughts? I assume I run my vac gauge connected in series with the vac line from the manifold to the overboost switch-over valve when setting it up?