Professional Red 4" Speedometer (60 MPH)The Faria Beede Professional Red features perimeter-lighted Black dial with stylish Red and White graphics, Black aluminum bezel, tear- drop White pointer and flat glass lens.Pitot tube type speedometers operate by pressure from the water being forced into the pitot tube. This pressure is then transmitted through flexible tubing to the bourdon tube movement inside the speedometer head where it is converted into a speed reading by the movement mechanism.∗Pitot tube sold separately.4" - Hole Size: 3.375" (85mm)Specifications:Flat Scratch Resistant LensBlack Aluminum BezelLED Illuminating around the Perimeter of the DialTear Drop White PointerFactory P/N SE9777*Sold as an Individual**Gauge Cover not Included