1. Connect the gyro's gain wire into the gain channel of the receiver, then connect the rudder channel into channel 4 (sometimes labeled "RUDD") of the receiver. 2. Plug the rudder servo into the servo input on the gyro, located on the bottom right edge of the device. 3. Turn on the RC helicopter and receiver, then rotate it left to see whether the rudder gyro compensates by moving the aircraft to the right. If the helicopter doesn't move to the right, press the "SET" button until the "NOR/REV" light illuminates, then use the right joystick to change the setting form green (NOR) to red (REV) or vice versa.