I'm pretty sure you have combined air & hydraulic. The Valid/Power Gear system is for air + hydraulic. Valid modified the Power Gear hydraulic system to do that. What I'm getting at is there are both air leveling and hydraulic leveling controls in the Valid/PG system, but hydraulic only in the vanilla PG system. Plus there is the operator panel, the level sense controls, and then the controls which actually operate the hydraulic pump or the air-leveling components. That may be why you get conflicting answers - there are really two systems.
Are you looking for the hydraulic part only, or everything in the Valid/PG system?
I suggest you join the American Coach Owners Group on Yahoo Groups. Lot's of discussion there on the Valid system, plus I think A guy from Valid follows the group and provide help.