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Mack tach installation problems

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We have a 3.9 4BT cummins engine with a 5.9 cummins engine sensor installed in the bell housing.  The Mack Tac goes right around to 6 o'clock position extremely fast when it starts up and pins itself at the 6 o'clock position.  The electric Mack  Tac # is CE17MT4117M and it has a 6 pin connector on the back.  Should this be able to hook up to the 5.9 sensor and operate correctly?  If anyone has a wiring diagram I would appreciate it.

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