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Pertronix tachometer fix. 140-160 1974

posted by  uniberp on  Mon Aug 30 15:23 CST 2004
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last visit: Mon Jan 31 07:08 CST 2011
[RELATED]

What do I do to make my stock tachometer work (and work accurately) with a Pertronix ignitor?

I read on a VDO site that you have to add a diode inline with the signal wire.

http://www.egauges.com/vdo_mult.asp?Type=Tachometer&Series=Vision&Cart=#Will%20VDO%20tachs%20work%20with%20points%20ignition%20or%20Pertronix?

"Purchase a diode #1N4005 from a local electronics store such as Radio Shack or Circuit City. Cut both ends of the diode so each is approximately 3/4” long. Crimp 1/4” female spade connector on the end of the diode with the silver band. Crimp butt-splice connector on the other end of the diode. Crimp the opposite end of butt-splice connector to the wire connected to the ignition signal source. Connect 1/4” female spade connector used in #3 above to terminal #4 on the back of the tachometer. Connect a ground (-) wire to terminal #3. Connect a switched 12-volt power wire to terminal #2. Set switches for appropriate amount of cylinders. "

Is this the trick?
M. Pergiel - Elmhurst, IL
--
'74 145e T-5 'Orange Alert'






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