23/04/2019
Rev 3
9
I.2.5.3.
Connecting the tachometer
Connected to the cigar lighter plug
This is the simplest solution. It allows you measure the engine speed with no need to open the
vehicle hood. On some vehicles, however, the engine speed measurement may be less accurate
than with the unit connected directly to the battery, because of filters installed in the vehicle in
order to avoid interferences coming from the engine.
I.2.5.4.
RPM measurement
Select RPM mode by pushing the rpm key.
Choose the RPM mode called Battery. After three seconds, it is required to select a cylinder
number. This number is corresponding to 4 stroke engine by default. If you want to measure a 2
stroke engine, see the picture below:
This counter is equipped with an automatic detection of cylinder number. In case of RPM loss,
when switching the device on, or when changing the number of cylinders, the counter will take a
few seconds looking for a stable RPM. When finally detected, the value can be seen on the gas
analyzer or opacimeter screen.
12
10
8
6
5
4
3
2
1
4
2
1
4 Strokes 2 Strokes
Cylinder number
