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Old 12-17-2015, 05:33 AM   #15
FF
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Join Date: Oct 2007
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Only a tach that is driven by an impulse counter which is mechanically driven , or a tach that is cable driven can perhaps be made somewhat accurate.

Most that are alt driven are no where near accurate.

Alt temp,alt load , belt age and load , pulley temperature all vary , as will the tach reading.

Best you can do with one of these is to use a photo tach at normal cruise and set the electric toy to match it.
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