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When I had a new rear prop installed, the shop checked the factory RPM gages on my plane, and they were always reading higher than actual - usually about 100 RPM. I can refer to their scaled list anytime I want to be more accurate, but I figure running about 100 low hasn't hurt me and the settings I use have worked well for some years now. Bottom line is I'm aware of it but not worrying about it.
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