Speedometer or mechanical cable problem?

[Churm]

Learning as I go. My speedometer sticks from 0 - 30 km/hr and then kicks in. The odometer & trip meter also do not work.
Is the sticking speedometer indicative of a problem with the speedometer or with the mechanical cable that runs to the transmission? Just trying to play the odds. Don't want to rebuilt the speedometer only to discover it was a cable issue.

Any advise?

Thanks in advance.

Steve.
1980 911 SC

[cowtown]

I thought the SCs all had electric speedometers?

[vizail]

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