Churm
Here are couple of thread that can help with your trubled Speedometer.
Tha 911 Speedometers suffer from the rapid damage of this gear and let me tel you is a nice fix. The gear on my Speedo was completely desintegrated
Don't be afraid to DIY.
Speed Odometer Gears
And
Odometer Gear replacement for Electronic Speedometers (long)
A word of Advice... when puling the counter needle out . reach down on the shaft and hold it in place with a thin nose needle plyers and twist the marker counterclokwise while puling out... Be Careful...!!!!! don't breack it..!
Vic
