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Rough Country Speedometer Calibrator “Error Code 90”

wangstarr03

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Hey all, I’ve had the RC speedo calibrator for several years but just had my truck in for service where it looks like things were reset and I need to re-calibrate the speedo for my 34s.

That said, when I plug in the tool, it gives me “error code 90: calibration updated” - anyone know what this means? My first thought is maybe the firmware on the actual tool needs to be updated but if that’s the case, I run into another issue: the software is windows compatible, only; I only have a Mac.

Any thoughts? Thanks!
 

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