Shawn,

You will find a problem with the 7C that a friend of mine did, and I've also seen it mention in a report on that radio done by Anne Marie Cross.

The 7C doesn't make a provision for dual elevator servos. You can slave another chanel to the elevator, and reverse it, but you cannot slave the elevator trim to the second channel. Only one elevator halve will move with trim. Your only real options are to use a Y harness and invert one servo if the control geometry will allow it, or use a reversing Y harness and mount the servos with the arms going the same way.

Larry