Mercury – Pitot/Speed Sensor Kit | 100 PSI SmartCraft Speed Input | 881879A15Mercury Pitot Speed Sensor Kit 100 PSI SmartCraft Speed Input 881879A15 Overview For boats running under 80 mph, a pitot style sensor is a simple and reliable way to feed speed data into SmartCraft. The Mercury 881879A15 Pitot Speed Sensor Kit delivers a 100 PSI pressure signal and includes the key harness needed for systems using the round 3 pin to flat 4 pin connection. It mounts easily on a MerCruiser sterndrive transom bracket or directly on the