Amazon.com: Garmin 010-11054-00 Shadow Drive for GHP-10 : Electronics
Amazon.com: Reactor 40 Hydraulic Autopilot, Core Pack with GHC 20 Control Head, Reactor 40 9-Axis Heading Sensor, Electronic Control Unit, Shadow Drive, Buzzer, Cabling and Connectors Without Pump : Electronics
Garmin GHP Shadow Drive Flow Switch Sensor 010-11054-00 - New Open Box | eBay