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  1. M

    Tach problems

    I got a 85 90hp johnson that when it reaches<br />4000 - 4100 the tach falls to 0, and when I throtle back to that point it comes back up to 4000.The boat still runs great while this happens and it is still charging.I also installed a new tach and it still does it. Could it be a bad diode in the...
  2. M

    tach quits at 4000

    I got a 85 90hp johnson that when it reaches<br />4000 - 4100 the tach falls to 0, and when I throtle back to that point it comes back up to 4000.The boat still runs great while this happens and it is still charging.I also installed a new tach and it still does it. Could it be a bad diode in the...
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