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I went for a ride at lunch and watched my RPM's at 30, 40, 50, and 60 MPH in 5th gear. It looks like I could use my tach as a spedometer! The only one I know for sure is that at 40MPH it was exactly 4000 RPM I had to watch the road and couldn't tell exactly but it looks like 3K RPM = 30MPH, 4K = 40, 5K = 50, 6K = 60 MPH. It doesn't help that my tach is mounted at a slight angle so getting a precise reading is difficult.
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