Matt,on the EF Yak.and the 35%Yak I use a single PowerExpander Super reg for two batteries,on the 37% Yak and Jonathans Extra I use one/battery.If I were to do it all over again I would go with the PowerExpander Super/Turbo Reg.s
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You are very close Jeff,just need to not sure that the "Nuckle Head" fills the tank with gas Before you fly.