The speedometer on my daughter's 95 Contour is off. This is 2.5 V6 with an automatic. At highway speeds it reads low by 5-7 miles per hour. In other words, if the speedo says that I am going 65, I am actually going 70-72 mph. Has anyone else seen this? One point is that (I believe) the 95 models are the only Contours with a speedometer cable. In the later years, its all electronic. How can I correct this?