[W126 Coupe] Vacuum Tube Coding

[L&D gardner]

Hi Folks

Does anyone know of a circuit diagram for the colour coded vacuum tubes,I am 
measuring 60kpa from the ivory tube from behind the engine to the bulkhead 
junction ,and the seats will lock @ 15kpa with a Mityvac at the same 
location on the bulkhead but the seats will still not lock as I seem to be 
getting losses from the dark red and yellow striped tube.Thanks


                                                                             
                                                     Kind Regards Dan 
Gardner 1986 560 SEC (Euro 220kw)