I might get a GPS, but really need to get this fixed first - it's off by over 20mph on the highway. My wife led me at different speeds so I know generally where my normal speeds are, but anything over 55 pegs the needle. Imagine that, a Vanagon running out of speedo :)

Part of my question, I guess, was if something this off can be calibrated, or should just be replaced?

john

> You can also use a GPS unit, if you have one, for this. GPS speed is
> pretty accurate as long as you drive at a steady speed on a straight
> stretch of road for several seconds to let it stabilize. On my Honda, I
> used a GPS and a tape recorder to log indicated speeds for the actual
> speeds I was interested in, and made a conversion chart to tape to the
> gauge face. Sorta like those compass error charts in airplanes.