A) Connect the tuning control tachometer and start the engine.
Note: Reverse polarity when connecting a tachometer will damage the transistors and diodes.
b) Compare the readings of the control and standard tachometers.
V) If the error is higher than acceptable, the tachometer should be replaced.
2. Checking the maximum speed sensor.
A) Measure the resistance between terminals 1 and 2 of the sensor.
Resistance approx. 730 ohms
b) Replace the sensor if the resistance value is different from the specified value.