DN7050
Newbie
I recently purchased a 1998 GMC Sierra 2500 (2WD, HD, long bed, extended cab, 5.7, 4L80E) which happens to be in almost new condition, no rust at all, looks new underneath and clean body too. Anyway the primary issue is the speedo reads about 15 mph high at 60 mph. I suspect the instrument cluster is not original, especially since it was originally sold in Canada but now has the US instruments. Anyway, is it possible to recalibrate the speedo and if so how?