>>
>>
>>There is nothing wrong with your speedo. All late model vanagon speedos that
>>I know of read way wrong. Like, when it says 75MPH you are really going 68
>>or something. They all do this. 
>>
>>I put on tires that are 2" taller than stock and it still didn't fix the
>>problem I still read significantly faster than I am actually going.
>>___________________________________
>>Derek Drew

What you need is having all four wheels to drive the speedo instead of only
one.