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Old 05-18-2017, 11:14 AM   #4
RichardJ
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Join Date: Apr 2010
Location: So Cal
Posts: 1,489
Re: HEI to factory Tac reads tooo Hi

It's a factory item on many '80s GM vehicles with tachometers. I have one on my truck that I took from a Z24 Cavalier in a wrecking yard.
It is shown on the lower right of this schematic.
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'67 GMC 2500, 292, 4spd, AC
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