Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** thank you for your question.
This speedometer system is very basic and easy to figure out. This is how easy it is for your issue.
If you speedometer did not work at all, that is when it is the trickiest. But if you remove the sensor and the gear is not stripped and the gear can produce ac current and the speedometer works at slower speeds, just not higher speeds. That is a speedometer issue. The speed sensor either works or it doesn't on these trucks. So the fact that your speedometer is working just not the right speeds, that verifies the speedometer it's self is your issue.
Do you have any more questions on this?
I will have blow some dust off the manuals to see what I have for that year for you. But I can say with 100% certain, that if the speedometer operation is erratic, it's a speedometer. If it was a speed sensor it would be all the time.
I will be online later this evening around 7 pm EST and I will look up that info then for you...ok?
The only connection would be the 4 philip head screws that mount the speedometer assembly to the meter assembly. If they are all tight, it's a speedometer.
I have been a Nissan Tech since 1990. I dealt with these trucks plenty back in the day to say.