Speedometer on 1999 Nissan Frontier

My speedometer is very eratic....doesn't work at all sometimes....other times it says Im doing 80 when im in a 30mph zone?????

2 answers
Could be a variety of reasons for this. We have seen Vehicle speed sensors and or gear, speedometer head or even a unified meter control cause this kind of issue. Most common is a Vehicle speed sensor (VSS). Need to check for codes in computer. If it has a P0500 most of the time that turns out to be something with the VSS. If not would need to run some tests to track down problem.
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