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Take a drive up to the SF Bay Area and I'll do it. You could even send me your ECM and I'll program it and send it back.
Seriously.
If for some reason I can't program it, I'll move your needle so at least your speedo is accurate. My cluster was reading about 3mph different than the input into the ECM anyway and even after getting the input/ECM calibration correct for the tires, I needed to also move the needle so it's dead on.
You have the input into the ECM that it and the trans relies on, but you also have the analog conversion into the needle reading that often is off.
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