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  • H/O HEI could, cap, rotor messing with tachometer
  • H/O HEI could, cap, rotor messing with tachometer
  • H/O HEI could, cap, rotor messing with tachometer
  • H/O HEI could, cap, rotor messing with tachometer

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  1. #1
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    Default H/O HEI coil, cap, rotor messing with tachometer

    I installed a Hypertech Powercoil kit on my '89. The tach started jumping all around when I first started it. We installed a new tach filter. Now it's stop jumping around but the tach won't read above 3000 RPM. Anyone else have this problem? Does anyone have a fix?

  2. #2
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    Can you describe in detail what all this kit replaced during the installation?

  3. #3
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    Here is the part. It is just a replacement cap, rotor and coil. 85-91 Hypertech Power Ignition Coil Kit - Cap With Coil Includes Rotor | Corvette Central

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