I got my tach and will be posting a "how to" soon. The tach only goes to 8k RPM. It shows idle at about 1000 rpm and ~7600 rpm at 75mph. I've revved it in neutral until it sounded like it was reaching the end of it's rev range. Based on the where the numbers stop and their spacing I'd say it went up to 10-12K rpm. Not something I intend to do again as I do not like my engine in little broken pieces.
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