These digital gauges are available in either 100 mm (4 in) or 80 mm (3.15") diameter and feature a polished chrome bezel, a black face, and white lettering. The gauge displays a range of 0-140 mph or 0-240 kph, along with a digital odometer/trip readout. With the built-in "drive-to-set" programming, you can install the speedometer, set it to DTS mode, drive a mile or kilometer, and it will automatically calibrate itself. Detailed instructions are included.