Quote Originally Posted by the evil twin View Post

I can't remember what the speed compensation % was but that is easy to set.
Just set it to agree with a GPS or SatNav it will be different for almost any truck due to tyre diameter and wear.
Calibrated mine today and is surprised me. My scangauge is at +12% and is more or less spot on with the GPS speed. TO confirm I tested with 2 GPS devices and both were identical. This surprised me, as my dash tacho is out by about 3km. SO when it shows 97, i'm doing a 100. I just assumed the scangauge then would be 3%.
But I got to 12% before it actually began showing the right speed. Interesting. This means whatever fuel stuff it was showing me thus far, was more 12% out ???