Mercury - Gen I Throttle and Shift Cable 16 Foot Mechanical Engine Control 8M0082489. 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 traditional Mercury Gen I mechanical control systems, it delivers a straightforward, familiar helm feel without electronic involvement. The 16-foot length is ideal for wide-beam boats, deeper hulls, and extended console layouts wher