Up to now I checked only by engine sound, but I think that it is very easy to use because it is possible to see how much rotational speed is available by idling adjustment etc, and also without having to connect troublesome lines.
Motorcycle 250cc installed and used as a tachometer
On 2018-03-25 18:42:44
FI · In a single cylinder (two revolutions per ignition), in order to install a commercially available tachometer, it is necessary to remove the tank and take the signal from the ECU, but we do not have the skill that can be maintained. This product can display the engine speed accurately and responsively just by inserting it in the cord of the spark plug. Easily installed on the side of the speedometer. The only dissatisfaction point is that you can only read numbers on the road where the street lights continue during night driving.