Tacho Signal Converter - Universal Tach RPM Adaptor

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$101.68
Brand
Unbranded/Generic
condition
New
Tacho Signal Converter - Universal Tacho RPM Adaptor
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Tacho Signal Converter

This is a tachometer signal adaptor / converter module. It is used to convert the frequency or type of tacho signal, providing an output to drive a tachometer designed or calibrated for a different number of cylinders, or designed to work with a different type of signal. It uses the existing signal as input, and provides a new fully configurable output signal.

A small physical size (50x50x20mm) makes its easy to find a location to mount it.

How does this work?

  • It receives either a DC square wave or AC voltage input - from the existing tacho signal, a hall or inductive sensor, or an ignition coil.
  • It provides 2 types of outputs:
    • A DC square wave with 50% duty cycle, selectable between 5v or 12v.
    • An AC coupled output for tachometers designed for inductive type sensors / AC voltage signals.
    The modules DC output is also capable of switching a small external inductive load, generating a 12v square wave with a high voltage inductive spike on the rising edge (the same as an ignition coil, for older tachometers that require the high voltage spike). A suitable inductor is included, or an automotive relay can be modified for the purpose.
  • The speed / frequency conversion is selected by a combination of 4 switches, as shown in the included instructions.
  • An additional trim pot is used to provide a further +/- 10% fine adjustment to the frequency conversion.
  • Alternatively, the trim pot can be used to manually select an output frequency from 0.1x to 10x the input frequency.
  • "Multi-fire filter", for use when the ignition coil input signal fires multiple times per cycle at idle (eg. Ford Barra engines).
  • The module uses a plug in connector with 5 wires (power, ground, input, 2 separate outputs).

Disclaimer
  • Note that this will not work with current triggered tachometers as found on some very old vehicles. It will however work with much more common voltage-triggered tachometers (that only connect to coil negative, not in series with the ignition coil), as long as an inductive load is also used.
  • All items sent the same or next business day with Australia Post Express

Mr Module - Automotive Electronics Solutions