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I used the Gear channel(Aux2 as well) with the gov assigned to that channel. Set the values for the headspeeds you want in various flight modes (Normal, Stunt1 & Stunt2) in the Gov function menu. You just need to plug your Atg into the Gear channel. There are multiple ways to do this, this is just one. Hope this helps.
Also, if you go to page 32 in the "Applications and Programming Guide" that came with the 12x, it covers the receiver plug connections and the Gov setup is on page 38. This manual is downloadable from JR's website as well.