I finally got a clue as to the location of the pertinent various schematic resources available and between detali.ru, starteckinfo/epc, AllDataDIY and this forum I've got a fairly good grip on replacing all the vacuum pipe, hose, nozzle, throttle, damper etc...for the intake and exhaust system.

I took the detali.ru part number matrix, pasted it into Word and then applied different colors each group of the line items that were the same and placed an order for all the parts. A day later I was able to get the Startekinfo/epc to work, doh!

Side Note:
The parts arrived and I think I under-ordered a 40mm hose (38 detali, 123 997 20 52) I also noticed that startekinfo/epc gives me a secondary schematic that is a closeup of the VCV section that calls for a set of elements I didn't order.

So anyway, tonight I replaced the vacuum connections on the Vacuum Amplifier/Pressure Converter, EGR Switchover and Vacuum Control Flap Switchover. I have two unanswered questions at this point:

The pipe (92 in detali, 000 987 22 67) indicates it should come from the bottom of the EGR switchover through the 4 way branch off fitting (77 detali, 117 078 00 45) via connecter (86 in detali, 602 078 00 47) to vacuum hose (95 detali, 617 997 08 82) to vac pipe 92 and then to VENTILATION. I traced the line and it stops in the battery compartment and is not connected to anything. I looked to see if there was anything from which it might have come apart but didn't see a thing.

Is this the way it's supposed to be?

Also, I can't for the life of me find any documentation on the "Vacuum Control Tap Unit". No part number, reference etc...other than listed in the AlldataDIY diagram. ???

Tomorrow morning I'm taking off the crossover manifold again to replace all the remaining elements in this portion of the vac system. I remember last time that I noted that a unique hose with a protrusion that sits in a slot on the VCV and connects to the green damper. I ordered all the parts and didn't receive a hose that has this characteristic. I don't want to reuse it but not sure what else to do. ??

I hope this was clear enough...I feel like there should be a quicker way of getting to my points but....I just don't know how.

PS. Is there a cheetsheat that lists/identifies items by all of the different names they seem to be called by each of the various resources...for instance:

Electric ChangeOver/Switchover Valves
Crossover/Switchover Manifold
Vacuum Amplifier/Pressure Converter
Vacuum Control Valve, VCV

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1991 300SL 71K miles young