I'm doing almost the exact same thing on a Singer 211u867 originally equipped with a clutch motor, EFKA controller w/ V720 control panel. I'm in the process of updating to a full function servo controller w/EPS (i.e. EFKA AB321/DC1550 or Ho Hsing i70) and restoring all of the pneumatic functions (foot lift, tension release, reverse, thread cutter).
I purchased the head along with a box of pneumatic parts (from 4 machines) and have only a vague idea of how to get it all functioning again. I don't have any documentation or photos of an original configuration, but I hope someone here does--as I too could use the help.