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

[BennieG]

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?

 

[Hib Halverson]

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

 

[BennieG]

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