User's Manual

Tachometer Sensor

Tachometer SensorTachometer Sensor

Tachometer Sensor

The tachometer (“tach”) sensor is used to

monitor the rotation speed of a vehicle

component such as a driveshaft and this

speed is converted into vehicle speed.

You will need to measure the distance your

model rolls in order to provide the Sensor

with enough information to give you an

accurate speed. We recommend that you get

a tape measure and measure several

rotations of the wheel to reduce the

measurement error.

Installation

1. Choose the mounting location

• In the drivetrain, after any clutch or transmission. We recommend that you do not try to

mount the magnets on your motor for magnetic reasons (electric motors) and balance

reasons (nitro motors).

• Smaller diameter mounting points are better.

• The tach sensor must be able to be mounted within 1-2mm of the magnet surface, so

you’ll need a solid mounting point that can position the sensor in the right place.

• The completed installation should be rigid enough that proximity is maintained without the

magnets impacting the sensor.

2. Install the magnets

• Stick two magnets together, mark the exposed faces, then separate them.

• Install the magnets with the marked sides out, exactly 180º apart to preserve rotational

balance. IMPORTANT: For correct operation, the sensor must see alternating north and

south magnetic poles.

• Ideally, countersink the magnets into the surface.

• Magnets may be carefully ground to smooth edges or reduce overall thickness; take care

not to overheat, as demagnetization may result.

3. Install the tach sensor