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Speed calibrator mess up my efi live?

zmnypit
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zmnypit Enthusiast

zmnypit

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I just recently swapped tire sizes now running a 35x12.50x20 and my speedo is off around 3-4mph at 70mph. I see rough country has a calibrator but my question is what happens when its flashed over my efi live auto cal? Duramax truck. I dont think I can just send my tuner in anymore and have it updated since the crackdown. 

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