Faria 4" Speedometer (F33113) is a Dress White Pitot tube speedometer that works by applying pressure to the pitot tube when water is pumped into it. This pressure is then conveyed to the bourdon tube movement within the speedometer head through flexible tubing and translated to a speed measurement by the movement mechanism. It features a white dial with prominent black graphics around the perimeter, a white metal bezel, a contoured black pointer, and a flat glass lens. Key Features: Dress White Speedometer 0- 80 MPH Scratch-resistant glass lens Negative ground voltage 12 VDC Adaptable to 24 VDC systems Dual Scales - Imperial and Metric Durable and dependable structure Extends the life of a high-quality design Made from high-quality materials Specifications: Brand: Faria SKU: F33113 Weight: 0.54 LBS Gauge Size: 4" Material: Aluminum Measurement Limit: 80 MPH Style: Dress White Operating Temperature: -22 degreeF to +185 degreeF Storage Temperature: -40 degreeF to +221 degreeF Voltage - Input Range (Volts): 12/24 V Torque: .57 - .80 Nm Mounting Hole: 3-3/8" (85 mm)