You are ordering the Auto-Trim option for the Gold Standard pitch servo that drives the elevator system.  The Auto-Trim option is installed inside the servo housing.  The drive to the electric trim motor is provided through the Gold Standard servo connector. This option will drive the 12/24 volt electric trim motor that is installed on your aircraft (we do not provide the trim motor). 

The price is $225 plus shipping (and taxes, in California)

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