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Sup Mod keeping the peace
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6,778 Posts
According to the FSM electrical wiring diagram, the signal wire from the tach runs to a resistor then to the ignition coil. Check the harness connections at the coil and check that the resistor has continuity, E.G. not burned out. The tach itself could have gone bad.
 

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NF Mod/Nissan Master Tech
2006 Pathfinder LE, 2003 Frontier SVE
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9,767 Posts
Most of the time it is the tachometer, itself, that fails.
 
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