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Tachometer and built-in strobe

Determining the type of tachometer

If you have a standard tachometer connected to the coil - it's a high-voltage tachometer. It needs 50-100 volt pulses to work.

If the tachometer was connected to a special output of the commutator, or to the ECU - it's a low-voltage tachometer. It needs 5-12 volt pulses to work.

If you cannot determine the type of tachometer - try a low-voltage circuit first.

Low voltage tachometer

Just connect the tachometer to the TACH output

High voltage tachometer

You need to take a coil from a conventional car relay, and connect in this way. You will receive a 50-70 volt pulse generator. It's enough to trigger the tachometer.

The second connection option is without using the TACH output. You collect signals from the primary windings of the coils using diodes

If the previous options don't work, use an ignition amplifier to amplify the pulse.

Configurable tachometer on PWM channel

If you need to generate a tachometer signal of a different frequency, or your tachometer does not work well with the TACH signal, use the PWM channel.

To connect a tachometer to a PWM channel, most likely you will need an external pull-up resistor:

  • from 2 to 10 kOhm
  • connected to 12V or 5V - depends on the requirements of your tachometer

Built-in strobe

The unit has a built-in strobe function at the TACH output.

To use this mode, you need to assemble a simple LED circuit. Use ultra-bright red or blue LEDs. White has momentum.

Attention

Do not connect LEDs before activating strobe mode! You will burn the LEDs!