For a real mess of vacumm lines, try a late '80s honda with carb. They basically had a pneumatic computer in that car under the hood.
BTW, now that I think about it, you have a 126 chassis, don't you. That may have a vacumm/presure pump under the back seat. Neat pump that provides vacumm to lock and presure to unlock. Still can use the mity-vac to test things. If a line won't hold a vacumm, then there is a leak. Rest of car's vacumm operated systems run off engine vacumm pump.