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Please help with tachometer problem!

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Old May 14, 2010 | 10:03 AM
  #1  
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From: Langhorne PA
Default Please help with tachometer problem!

The tachometer reads about 700 to 800 idle but some times it reads 300 idle when the car is running fine. What could it be? Some one told me there’s some kind of filter the distributor sends the signal too before the tachometer reads the actual rpm’s and the filter might be bad.. Where can I get a new one at? Does anyone know what the problem could actually be?
Thank You
Andrew
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Old May 14, 2010 | 10:49 AM
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From: penngrove ca
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Best to put year & mods in post. There are posts on trouble shooting tach problems. But, to answer your ?; yes, there is a filter that could be bad.
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Old May 14, 2010 | 11:20 AM
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Tach filter problems are normally that the tach will read too high. This assumes that you have an 'electric' tach rather than a mechanical one [depends on C3 year]. The tach circuit board (electric tach) can also create problems.
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Old May 14, 2010 | 12:23 PM
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its a 1981 corvette all stock i don't know if its mechanical or electric tach though.
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Old May 14, 2010 | 05:23 PM
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'81 is all electrical
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Old May 14, 2010 | 07:02 PM
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From: Dayton, Ohio
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Bypass the filter at the distributor and see if the tach works better. If it does buy a new one or just leave it bypassed.
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Old May 16, 2010 | 11:31 AM
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thank you everyone for your help
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