Dynojet Optical RPM Sensor - Manual (Page 11)

O P T I C A L R P M S E N S O R I N S T A L L A T I O N
Installation
Optical RPM Sensor Installation Guide
1-5
7 Verify both the green and red lights on the optical sensor are on. Both lights will
be on if the optical sensor in the correct position. The red lens on the sensor
must be pointed at the reflective tape.
If the red light is not on, the sensor will need to be relocated or adjusted. This
condition indicates that the sensor can not see the reflective tape.
Disconnect the negative battery cable any time you work under the front of the
vehicle. This will prevent the vehicle from starting and ensure your safety.
7a Try to relocate the magnetic base and sensor assembly closer to the
reflective tape. If this is not possible, you will need to adjust the sensitivity
on the sensor.
Be sure the placement of the magnetic base and sensor assembly do not
interfere with the operation of the vehicle. The vehicle’s fan may turn on at any
time; always use caution when working around the fan.
7b Use the adjustment tool to turn the sensitivity knob until both the green and
red lights are on at the same time.
Note: The red light will flash every time it sees the reflective tape. While running
the vehicle the red light will be flashing very fast and may be difficult to see.
Figure 1-5: Optical Sensor—Verify Position And Proper Function
red lens
green light
red light
sensitivity
adjustment tool