If using the 72 mhz.... you can use either a futaba servo synchronizer(msa-10) or JR matchbox. This will allow you to set equal throws, trim and all. Someone on here is selling the matchbox for $25 EACH - USED

But again..in my experience with the 2.4ghz...i still chose to use the synchronizer because there was a slight lag between the 2 channels using the radio's dual elevator function. If anyone can provide insight on this, please let us know.