You can adjust the speedo, but it's tricky. I had my girlfriend at the time put her car on 60mph cruise control and get next to me on the highway. I then matched my speed to hers and put my cruise control on, and then pulled the needle off the VX gauge and carefully placed it exactly at 60mph. While I know it is still not perfect, I know that it is close enough for me. Yes this involves removal of the gauges, but it really is pretty easy.