hydraulic drive not visible on integra display

One of our White 8824 hydraulic drives was not showing up on the Integra monitor this spring as we removed it from storage.  After a couple hours of troubleshooting we found out that it was the shaft speed sensor on the White planter.  The agleader cable plugs into it for its shaft data.  It was kind of hard to troubleshoot.  We tested by putting a manual 5.0 mph simulation on the display to get the shaft to turn.  When we stood behind the planter the hydraulic drive, which was not being identified, was turning much faster.  Also noticed that we lost singluation blower air pressure once the clutches were turned on.  When the clutches were disabled, air pressure returned.  Note our planter does not have a PTO pump so both the hydraulic drive and blowers are ran by a single valve.  Once we identified the shaft sensor this made sense as the display was directing all available oil pressure to the shaft to get it to turn which robbed the air oil.  Another step we took in troubleshooting was swapping the seed command cables from channels 1 and 2 to see what effect it had.