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kucharskimb kucharskimb is offline
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Join Date: Aug 2004
Location: Houston, TX
Posts: 895
before you burn up your tach...

The CDI unit and factory tach use a sine wave, and new ignition modules use a square wave signal. they are not compatible.

When I installed a new optical pickup/electronic ignition, I had to have my tach's guts replaced with a new tach's guts. still looks like factory.

I do believe you can use a tach adapter to solve this problem, also.
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Matt
72 911T Targa - Sold

Hang up the cell phone. Put down the Latte. Ignore the kids in the back seat.
Use your blinker when you want to change lanes. AND DRIVE YOUR Fu@#!NG CAR!!
Old 01-29-2010, 05:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)