Electronic Control Unit (ECU)Garmin’s Electronics Control Unit (ECU) is made specifically for the GHP 12 Autopilot System.Compatible Devices:GHP 12 Autopilot SystemGHP Reactor Mechanical/Retrofit/Solenoid CorepackWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.