Hey guys, I have a 1997 k3500 diesel. Speedometer is very inaccurate. It is more accurate at lower speeds, but gets progressively worse. At an actual 3mph it’ll read 5, then at 10 it’ll read 15, at 45 it’ll read 50, but once we started getting into the realm of 60, 70, 80, the truck reads 10-15...