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 - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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