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Re: Adjusting a factory tach.
Good to know, and thanks for posting. It is very tempting to add a tach to my dash cluster, and now I see how to calibrate it.
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Rick
-69 GMC 910 Long Box, 350
-98 Chev Silverado 1500, 350 Vortec 4L60e
-08 Mustang GT Convertible
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