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By Florida_Phil - 6 Years Ago
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Ever since I swapped out my points and condenser for a Pertronix I unit, my electronic tachometer has gone crazy. The Pertronix website says to put a resistor or capacitor in line with the wire going from the tach to the distributor. It also gives a number of options. Anyone have any input into this? Thanks!
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By Gene Purser - 6 Years Ago
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I bought an Autometer combination electric speedo/tach combination and tach was badly erratic with Pertronix. Pertronix said to use a shielded wire from coil to tach, didn't help. I converted back to points, still erratic, so I sent the gauges back. On my flathead with a scruby distributor/ Pertronix I had an erratic tach (Omega Kustom from Speedway). I had a ballast resistor mounted from the points system. I ran the coil for the pertronix behind the resistor and put the power lead for the pertronix ahead of the resistor. That worked except for a little bobble in the needle at idle.
EDIT: The site automatically substituted "scruby" for c**vy.
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By Talkwrench - 6 Years Ago
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Never had an issue. 
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By Florida_Phil - 6 Years Ago
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Here's a follow up on this issue. I have a $50 Bosch electric tach in my '55 TBird. I bought it from Summit and it fits in the original tach hole. I changed it when I switched to a 1957 distributor without tach drive. It worked perfectly until I installed a Pertronix I module and Flame Thrower coil. It worked OK until about 3,500 RPM. After that, It would jump up to 6,000 rpm plus and I knew it wasn't reving that high. I'm a decent engine builder, but not that good. Anyway, I went on the Pertronix website and they told me what to do and it was an easy fix. I installed a 10K 1/2 Watt resistor in the wire leading to the tach. It works perfectly now.
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