I have 94 e320. Maybe the following will help.

[a] Connector located on intake manifold nearest firewall feeds "135" one of two check valves located on top of brake booster.
[b] Connector located right rear corner of actuator using a "fat" hose feeds "Y58/1" [Removal of air intake tube makes it easy to access]
Connectors [c & d] located front of actuator
[c] "Y" feeds left port of Electric CrossOver Valve "Y27 & Y32" mounted on front of engine and Fuel pressure valve "40" on front of fuel rail.
[d] Single feeds "B5/2" mounted between "Y58/1" [labeled MOT] and fender edge.

Hi Arthur. Thanks for all your help especially with my actuator. Now up to 163 mi and running great.