4" Speedometer 30 Knot for Mechanical Pitot Tube - Euro BlackThe Faria Beede Euro Black style speedometer gauge features a black aluminum bezel, black dial, white pointer and graphics displaying speed, with perimeter back lighting and a flat glass lens.The Faria Beede speedometer gauge is for use with a mechanical pitot tube sender to gauge the speed of your boat. The sensor drops into the water off the back of the boat and receives different levels of pressure depending on the speed the boat is travelling through the water. This pressure equates to a reading in the dashboard mounted speedometer.  This speedometer measures up to 30 knots.Features:Euro Black Faria Gauge Style12V DC systems, 24V requires adapter FAR9030430 KnotsFits a 85mm (3.4") Diameter HoleWhite Gauge PointerUse with Pitot Kit FAR91106Supplied with a Backing Clamp