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International Automotive Technicians Network
Re: GM speedometer correction
Posted to Technical Discussion Forum on 1/14/2006

If you want to purchase software to do it, Tunercat is a good choice. There are several other ways to do it, but all end up with the same result and TC is probably the easiest for you to work with if you do not have anything to edit with now.

TunerCat, HPTun... Login to read more.