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While the above two areas of concern are valid, your tachometer might of just failed. It's electronic, and electrical components wear out or just stop working. My tach quit working on me also. What did I do? I bought somebody else's partially broken cluster for cheap, and swapped tach gauges. Now I know when to shift. Lol
For trouble shooting, go to your FSM and figure out which one is your tach signal wire that feeds into your cluster. Then, take a multimeter to it and measure for voltage while you rev the engine. Rpm's go up, voltage goes up etc.
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