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    Tachometer goes crazy at random

    The battery eh? Thats interesting, didn't think of that. Hopefully that is the problem as it would be a cheap fix, and I really have no clue what else it could be.
  2. T

    Tachometer goes crazy at random

    Ok, so let me first start by saying that this issue has been apparent for about 2 months and happened out of nowhere on my 1991 SHO MTX with 69k miles. I originally thought that it was the crank or camshaft sensors, so I performed the 60k service replacing both sensors, water pump and the DIS...
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