How do you recalibrate 1997 GMC speedometer?

To recalibrate the speedometer on a 1997 GMC, first ensure that the vehicle's tires are the correct size, as changing tire size can affect speedometer accuracy. Next, locate the speedometer cable, usually found at the transmission, and check for any damage or disconnection. If you need to recalibrate, you may require a specialized tool or software, or you can disconnect the battery for a few minutes to reset the speedometer. For precise calibration adjustments, consult the vehicle's service manual or a professional mechanic.