C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old May 6, 2011 | 09:22 AM
  #1  
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Default Tach Filter

Do I need one ?
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Old May 6, 2011 | 09:42 AM
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For a stock electronic tach, yes,....like off a 75-77 shark.....

I built my own, but they are available....

without one, you get very erratic readings, and WAY too high a rpm reading....



send me a email, I have to look through files, but I can send a schematic for one if needed....

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Old May 6, 2011 | 11:04 AM
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This is a 79 with the printed circuit thing on the back.
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Old May 6, 2011 | 11:07 AM
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The tach filter prevents 'other' electrical signals from affecting the readings; it also cleans-up the tach signals before they reach the board. So, yes...you need it.
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Old May 6, 2011 | 06:43 PM
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OK...Thanks
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Old May 8, 2011 | 12:17 PM
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Default You can make your own for a couple of bucks...

see below. Schematic & part numbers in this thread.

http://forums.corvetteforum.com/c3-t...schematic.html
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