Rev Counter Tacho Signal Information

MBE Systems, The Elliott Centre Love Lane Ind. Est., Cirencester, GL7 1YS, England
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4 Cylinder Tacho Signal (Open Collector with 12v Pullup)
Tacho Signal can source about 14mA

IMPORTANT NOTE
In some instances we have seen tachos such as VDO, although supposed to run on this signal, appear to drag the output voltage of the tacho signal down to approx. 3 volts. On some occasions this has been overcome by fitting a 390 ohm (1 watt) resistor across the tacho signal wire on the tacho and its 12V supply wire.

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