Hour Meter count unit in ignition pulses of spark plug. Count the interval of pulses and after disposal then display X/M.
It can reflect turning speed of engine. When start engine,turning
speed and running time will be alternate displayed. Turning speed will be displayed for 58 seconds and running time for
2 seconds. When stop engine, time will be displayed. First display in minute when up to 60 minutes, it will switch to
hour. If only two figures displayed it means minutes,for example 03 mean
three minutes; If 4 figures displayed in screen it means hours,for example 0024
mean 024 hours.