Koso has over 30 years of experience in designing and manufacturing high quality products. They are known for their product's quality, reliability and capability. The T&T Speedometer/Tachometer is perfect for any bike. The display is easy to read with multiple function readouts and a fast response time.; Measures 3" diameter (without bezel), 3.4" with bezel x 1.75" deep (without bezel) Stepper motor allows for a faster and smoother response and more accurate information Gauge includes: speedometer, tachometer, odometer, volt meter and clock Indicator lights in multiple colors allow for easy recognition Speed is displayed digitally; RPMs via analog gauge Includes full array of setable indicator lights including shift light, warning light, fuel meter, neutral, and high beam Uses single from rotor or sprocket to calculate speed