Mercury - Gen I Throttle and Shift Cable 12 Foot Mechanical Engine Control 8M0082485. 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 using classic Mercury Gen I mechanical control systems, it delivers a straightforward, predictable helm feel without electronic involvement. The 12-foot length is well suited for wider beams, deeper hulls, and layouts that require additio