Whoa I was totally wrong in what I first typed here. Apparently not such a dumb question.
Check out the different setups you can have on this link below. They are at the bottom and you are setup #1. You connect the batteries at the switch inputs (Deans connector), the regulator at the switch output (Deans connector). Then you go into a single receiver (JR connectors?). What input and output plugs do you have on your Sahara regulator? Since my receivers have the JR servo/battery ports I'd need a Deans plug on the input and two JR plugs on the output of the regulator. If your receiver can accept a Deans then you'd just need a single Deans. There's quite a bit to this in order to get it all right. The only thing I don't like about this setup is that the regulator is the single point of failure in the current path. I'd prefer two regulators. Maybe with the A123 you can get rid of the regulators altogether.
http://fromeco.org/Products/04FRCWO-431b/Default.aspx