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Tachometer Does Not Work!!!

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I have an 89 MJ that is a 4x4 and automatic on the column. Did the gauge upgrade to the one with the needles and changed sending units. All is fine with the exception of the tach does not work. I cleaned the connectors and still nothing. The tach previously worked (seen it 1st hand). What could be the problem and how could I fix it. As always any and all advice is appreciated,


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