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My tach reading is low, or I am missing the first digit of the tach number. What is wrong?

April 26, 2017digit low MISSING Reading tach wrong

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My tach reading is low, or I am missing the first digit of the tach number. What is wrong?

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Check the limits. The tach divide by, or calibration number, may be set to a higher number than appropriate. The tach divide by number is equal to the number of times the engine fires per revolution. For most engines, the tach divide by should be set to one (1). See the operating instructions for setting the tach divide by.