It just wanders about at 500ish rpm, and I checked with a scope and found it is pulling low too long, the audi needs 50% duty on tacho signal (I put scope on another one I had access to).
An MSD usnit was mentioned in this thread:
Which one do I use?
8910, 8910-Esomething, 8920...
Or is there an easier way, or circuit I can make that you may know of.
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