[Al Skierkiewicz]

You may be looking for a method to connect the variable regulator to a motor for pressure control. The servo would only give a fraction of a single rotation which is a very small change in overall pressure. However, the rule against modification of pneumatic components seems to come into play. I would think a question to the Q&A about the legality of attaching (as in gluing) a gear to the variable regulator might be appropriate. However, please keep in mind that the valves generally stop sealing at 20 PSI so that limits your secondary pressure range. Remember that 60PSI is the working pressure you must maintain ahead of any secondary pressure changes.