Mercury - SmartCraft Pitot Sensor Kit Pressure-Based Speed Input 8M0090447. Overview. Many mid-range FourStroke engines don't include a built-in way to deliver pitot-based speed data to SmartCraft, and that's where this kit comes in. The Mercury 8M0090447 SmartCraft Pitot Sensor Kit gives the engine a clean pressure signal that SmartCraft gauges can read as boat speed. It's a simple add-on that keeps the helm informed without relying on a paddle wheel or GPS, and it's built specifically for the