Ok I am stumped my 96 nv4500 truck's speedo is off by 7 mph pretty much as soon as I move all the way through 70. I show 17 at 10 and 77 at 70. That is not a wrong speedo gear or tire size issue as those would be ratio based error. Right ? How do I fix this thing?
Speedo ?
- Thread starter badbowtie
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