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Even overhauled tachs have a 200 to 400 rpm error!!! That is why you get an electric tach! I have replaced the mechanical tach for a new electric tach in about 12 planes now. EACH owner says, "Why didn't I do this sooner!"

You can get a stand alone EI R-1 electric tach for about $400.00. You spend almost that much for an overhaul on your outdated mechanical tach! Do the math again...