Digital tachometer CPU programming techniques used to all the data written into the internal single board computer with a simple structure, compature, strong function, stable peformance. 4 high-brighting red digital tube, high brightness, which will help observation, direct reading speed data. Using Hall sensors, can be an effective shock, dust, sensors pick up three per turn signals, eliminating the digital tachograph in general, when low-speed count are not allowed to show flashes of shortcoming. Display precision, ≤ 2%