Why does the odometer not work on a 1988 GMC?

The odometer on a 1988 GMC may not work due to a few common issues, such as a broken speedometer cable, a faulty speedometer gear, or problems with the instrument cluster itself. Additionally, worn gears or a malfunctioning electronic component in the odometer mechanism can cause it to fail. Checking these components can help identify the specific cause of the problem. Regular maintenance or inspection may prevent such issues from occurring.