Mercury – Water Pressure Sensor Kit | Engine Monitoring Series | Composite & Brass Assembly | 8M0157742Mercury Water Pressure Sensor Kit Engine Monitoring Series Composite & Brass Assembly 8M0157742 Overview When you spend a lot of time on the water, you start to notice the little things the way your engine sounds when its running right, the way the hull feels when its trimmed just so, the sense of calm that comes when everything is working the way it should. A water pressure sensor is one of those small, behind the scenes parts that keeps that