You would need to know the drive gear ratio if you were using an old (pre-early 1970s) mechanical tachometer that works off a spinning cable, but a '14 shadow 750 shouldn't have a thing to make a cable spin. You would use an electronic tach, which uses the spark plug wire as a signal.
this post was submitted on 06 Aug 2023
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Thanks a lot! I had no idea, and this helps so much :)