The injector pump also turns at half the speed of the crankshaft. There has to be a 50% reduction somewhere between the crankshaft and the injector pump head. My guess is that the sensor is reading a full speed gear on the replacement engine and a half speed gear on the original engine. The sensor reads the pulse of each revolution of the gear. Your tach is calibrated to translate two engine revolutions per pulse. The correct tach for that engine would be calibrated to read one engine revolution per pulse. Repeat - that's a guess.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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