I have done it the same way rich has suggested with my 12x on a p-47 thunderbolt. But for my BVM F-100 and F-86 i have used this sequencer from jet central to do everything for me as both of these planes need the inner gear doors to be closed when the gear are in the up and down position. This is a very nice unit as it also has a low air fail safe built into it and it will also handle running straight 7.2 volt thru it as i have all high voltage 8911 servos thru out my F-100 i didn't have to put a regulator in the plane and the system has been flawless.