Mercury - Gen I Throttle and Shift Cable 14 Foot Mechanical Engine Control 8M0082487. The Mercury Gen I Throttle and Shift Cable is a mechanical control cable designed to connect the control box to the engine for direct throttle and shift input. Built for boats running traditional Mercury Gen I mechanical control systems, it delivers a simple, predictable helm feel without electronic involvement. The 14-foot length is well suited for wider beams, deeper hulls, and extended console layouts where