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Tach not working

  • 1985
  • 944
Mileage: 
59 000
Electrical
Conyers, 
Georgia

I have a 1985.5 in which the Tach does not work, gas mileage does.  I have read through the post on the subject.  I changed out the tach with one that was supposely good, no change.  I know the DME sends the signal, and that I need to check the wiring between components.  But what sends the rpm signal to the DME?  Does the speed or the reference mark sensor have any thing to do with it?

Thanks in advance.

Richard.

 

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