Mercury - Gen I Throttle and Shift Cable 15 Foot Mechanical Engine Control 8M0082488. 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 natural, predictable helm feel without electronic involvement. The 15-foot length is ideal for wide-beam boats, deeper hulls, and longer console runs where additi