Quote:
Originally Posted by 70GS455
If it's the MSD 6AL box and your using the dedicated grey tach wire, the issue could be the tach. That signal is a 20% duty cycle square wave, which means it's 80% dwell, or 36 deg dwell. The factory tach will have trouble with 80% dwell as the rpms climb. There are those of us that have modern circuitry available that handle large variations in dwell very well.
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Who is “us”, and what are the “modern cricuits” of which you speak?