This is a perennial problem. Somebody could make a dollar or two publishing diagrams of just the vacuum systems in different models. Some are available and some aren't, and it seems like the ones that are available are always partial or mixed up with other things. If some diligent mechanic would make the diagrams they could sell books, ebooks, access to a web site, or whatever and make their boat payments.

I've wished before that I had the lore to do this myself, but unfortunately I'm a prospective customer for such a thing, not a producer of it.