Pelican Parts Forums - rev counter 3.0

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- - rev counter 3.0 (http://forums.pelicanparts.com/porsche-911-technical-forum/253669-rev-counter-3-0-a.html)

Hi

we finished (well almost) the 3.0 conversion for my 911 T 1973. only the rev counter is not working anymore,,, common?

than ks!

Did you check the Black/Violet wire at the back of the tach for pulses from the CDI 'TD' output terminal with an oscilloscope or CMOS logic probe?

The Black/Violet wire has to go through the 14-pin connector at the engine electrical [relay/fuse/CDI] panel ... a common problem area where corrosion can be found. Cleaning of the 14-pin connectors should be done very, very carefully, as the terminals are silver-plated brass ... no abrasives! Q-tips with 9% pickling vinegar, isopropyl alcohol ... are safe, followed by rinse with distilled water and air drying.