These power steering units include just the power units w/o electronics and are designed to work seamlessly with the TrollMaster Pro 3 remote throttle/steering system. They allow you to steer the auxiliary or gas powered trolling motor from anywhere in your boat.The T4 system will fit every kicker motor with a tilt tube and install in minutes without taking any room away from your transom. It includes a connecting rod with quick disconnects for versatile applications. Requires a minimum 9" clearance between the main engine and kicker motor. 781-550100ANE and 781-550101ANE- Install anywhere on the transom and include a connecting rod to go between the main engine and the kicker motor with quick disconnects. 781-550102NE: T-4 Electro Steer-Freshwater http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/55-0102_spec_hansen.pdf 781-550103NE: T-4 Electro Steer-Saltwater http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/55-0103_spec_hansen.pdf for 102 and 103 http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/55-0102,_0103_Install.pdf 781-550100ANE: Electro Steer-Freshwater http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/electric-steer-and-steering/electro-steer-remote-auxiliary-steering-model-100-freshwater/55-0100A_Spec_Sheet.pdf 781-550101ANE: Electro Steer-Saltwater http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/electric-steer-and-steering/panther-101-saltwater-electro-steer/55-0101A_Spec_Sheet.pdf for 100 and 101 http://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.r41.cf2.rackcdn.com/panthermarineproducts/55-0100A_Install_pub_hansen.pdf