Mercury - Analog Water Pressure Fitting Kit Engine Port Hardware 32-8M0063663. OverviewThis kit gives you the engine-side fittings you need to hook an analog water-pressure gauge to a Mercury F150 EFI FourStroke. It taps the engine's pressure port cleanly and sends a steady signal up to the gauge. Out on the water, it helps the gauge read smoothly so you can keep an eye on cooling flow without guessing. It's a simple, bolt-on kit made specifically for the F150 EFI.. Key Features • Engine-Side Fi