Intellitronix LED Digital Speedometers are microprocessor-controlled with an accuracy rate of 0-60 mph, a quarter-mile elapsed time recall, and designed for use with any mechanical or electronic transmission. Each LED digital speedometer is 3-3/8 inches in diameter, 1-1/2 inches deep, and contains a black face with a bar graph that lights up in your choice of four super bright LED colors; along with a black or chrome bezel. Using a sending unit (sold separately) these microprocessor controlled speedometers have a peak top speed recall of 255 mph, and are programmable with high-speed recall. By simply pushing a button, you can calibrate this speedometer to adjust for different tire sizes, wheel sizes and gear ratios. LED digital speedometers come complete with an odometer, trip odometer, automatic night dimming, and in-dash mounting hardware.