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Mack&Cheese

Tachometer doesn't go above 1400 RPM,

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On my '91 Mack RD688S the tachometer doesn't move much at all and usually stays in the 1400 RPM range regardless of engine speed.

Where should I look first?

Thanks!

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Magnetic sensor may be dead.

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Thanks Jim, I will start there first.  Appreciate the feedback!

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