Have a 5488 and just bought a 12 Row 7200 Vac planter. and wanted to get it hooked up to the correct aux valve. I have a single hose coming out the back of the tractor that i believe is a motor control return hose. also the planter comes with a valve to adjust vacumm pressure. do i still use it or do i open it up and control it by the tractor any help would be greatly appreciated.