Yes, the speedometer seems to be correct. We have checked the VSS, and it seems to be fine, it actually is not internala and is attached to the rear wheels. Well we had our mechanic check it, seems to be fine. One thing he didn't know about was what S/E set speed meant? It popped up on the computer for a couple of diff. things and is reading 0mph? Right now we have it in the Tranny shop, apparently after putting it on the tranny puter, they found out that something is plugged or stuck in the tranny! Hoping this will fix everything. Just sucks that we have to use our warranty already, but I suppose on the other hand I"m glad I have one.