Mercury – Gen I Throttle and Shift Cable 25 Foot | Mechanical Engine Control | 8M0085939Mercury Gen I Throttle and Shift Cable 25 Foot Mechanical Engine Control The Mercury Gen I Throttle and Shift Cable is built for boats using traditional Mercury mechanical control systems that require extended routing length. Designed for legacy Gen I control interfaces, it maintains a direct, hands on connection between the control box and engine to support smooth throttle input and predictable shiftingespecially helpful for wider hulls and longer