Mercury - Oil Pressure Gauge L-H Engine Protection Monitoring White Face Black Bezel 79-8M6020060. OverviewThis L-H oil-pressure gauge gives you a clear, relaxed read on how the engine's lubrication system is holding up while you're underway. The needle moves in a smooth, predictable arc, so any change stands out with just a quick glance. Out on the water, it feels like one of those quiet checks you make without thinking-steady, simple, and always there when you need it. It's the kind of gauge t