About a year ago I installed full Auto Meter Phantom gauges, including a 5" tach and speedo in my stock gauge console. The speedometer needle bounces all over the place. It gets real bad around 60mph, then gets better at about 80-85, but still bounces. The bouncing also gets a bit better when it is colder outside. I have a new speedometer cable running from my Muncie, and I have tried tightening it but it won't tighten any more. I have heard this might be caused by the little pinion near the output shaft. Also, the speedo is not calibrated perfectly.