Mercury - Analog Water Pressure Fitting Kit Gauge Connection Hardware 32-8M0088855. OverviewThis fitting kit gives you the parts you need to hook an analog water-pressure gauge to a 2.1L Mercury FourStroke. It taps the engine's pressure port cleanly and sends a solid pressure signal up to the dash. On the water, it helps the gauge read the way it should instead of bouncing, lagging, or sitting at zero. It's a small kit, but it's the key to getting an analog water-pressure gauge working on these