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As others have noted, I too use the tach quite a bit to make sure I am keeping my new bike between 2 and 3 thousand rpm. Having previously ridden shovel head bikes, my previous riding habits would be considered "lugging" on the twin cam versions.
I don't know, after having the EGC for 4-5 months now, I swear the tach screws me up more than it helps. After years of riding sport quads and my Shadow with out a tach, I just shifted by sound and feel. Everything was fine. I still do the same with the EGC, then find myself looking at the tach and second-guessing "should I upshift, downshift, what to do, maybe put tape over this damn thing"