Instructions
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.
Plug the rudder servo into the servo input on the gyro, located on the bottom right edge of the device.
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.
Press the "SET" button until the "Limit" light (the fourth light from the left) illuminates. Move the rudder joystick as far left as the aircraft's mechanics permit, then press the "SET" button to set the limit. Repeat this process for the right limit setting.