Mercury - Gen I Throttle and Shift 18 Ft Mechanical Control Cable 8M0085947. The Mercury Gen I throttle and shift cable is designed for Mercury mechanical control systems that require extended routing between the helm and the engine. It is well suited for larger center consoles and layouts where longer cable runs are necessary to maintain smooth, predictable control feel. The 18-foot length provides the additional reach needed while helping avoid tight bends and unsupported spans that can affect