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LM2917 Tachometer for V12


New Member
Alex, did you eventually get a tacho that works ? I have the same problem, checked all the resistors and capacitors and all seems ok so i suspect the 'unknown' TI chip is gone.

There were 5 wires and 6 wires OPUS systems. The 5 wires picked up the tacho signal directly from the '-' of the coil through a 6.8K Lucas resistor .

I am now using a Petronix ignition system, it works very well


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