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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

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...