Well I know there are thousands of posts on the speed sensors but I could find one that fit my problem. Well I just bought a new speed senor and it worked for about a half a day. It started to bounce, maybe a most 5 miles over and below the speed that I was going. Then the next day started off fine and then started to bounce 10 miles over and below the speed I was going. Well I check the cluster and made sure the screws weren't lose and checked the connects and they where fine. Well when I drove it again its started fine then started to bounce crazy. well I pulled over to the side of the road and came to a full stop and when I started to drive again the Speedometer was working fine and it worked fine all the way back to my house and that was about a 10 mile drive.....So does anyone have any clue on what it could be????