Mercury - Platinum Plus Throttle and Shift Cable 20 Foot Mechanical Engine Control - 858342A20. The Mercury Platinum Plus Throttle and Shift Cable is designed for Mercury mechanical control systems where smooth, dependable response is required over longer routing distances. Featuring Platinum Plus construction, this cable delivers a direct mechanical connection between the helm and engine while reducing internal friction to maintain steady, predictable throttle and shift movement. The 20-foot le