Mercury – Pressure Transducer Kit | 100 PSI SmartCraft Speed Input | 859210A1Mercury Pressure Transducer Kit 100 PSI SmartCraft Speed Input 859210A1 Overview OptiMax engines rely on a steady water pressure signal to deliver accurate SmartCraft speed readings, and this kit provides exactly that. The Mercury 859210A1 Pressure Transducer Kit gives your engine a clean 100 PSI pressure input by plumbing the sensor to a speed pickup tube and wiring it directly into the SmartCraft sensor plug. Mounted on the transom bracket or in a