Actually the servo is turning the same direction, you have the servos facing opposite ways. You can get a servo reverser, program your transmitter to reverse the channels (with trim link on) or you can use one Hitec and one Futaba servo.
ORIGINAL: mnrcaerobat
I am trying to use two elevator servos on my next plane. I soldered them together and the servos go in opposite directions. I tried switching the red and black wires, and that didn't work.