Hello mrbrian,

Send me a PM and I can forward you a document with lots of pictures that I wrote about adjusting the vacuum and transmission pressure. Bear in mind that it is based on a 1981 300SD with an adjustable VCV. If you end up with another non-adjustable VCV at least you'll be able to adjust all the other related components. If you find an adjustable one, you'll be able to adjust everything.

The document is too large to attach (1.8 Mb) otherwise I would.

Hope it helps.