Bouncing Speedometer (Page 1/1) Rjberner46 OCT 17, 10:03 PM Any idea why my speedometer bounces around on higher speeds? It fluctuates about 10 MPH slower once you get up to 60 mph bouncing up and down. Any Help is appreciated. Rickady88GT OCT 17, 10:18 PM I can't say what is wrong with your gauges, but what I can say is that the GM style or type of drivers for the gauges can be prone to malfunctions like this. I have a Z71 truck with a malfunctioning gauge on the oil pressure gauge. This type of gauge used a motor to drive the needle, that can fail and cause the needle to jump or glitch. I will fix my Z71 issue by changing out the driver motor that moves the needle. Search the YouTube videos on gauges of this vintage. Rjberner46 OCT 17, 10:24 PM I will look into that. Thanks.