speedo

Forum: 

Hi everyone, I'm a newbe on here and already have a problem. My speedo display is starting to 'hunt' and displays two to three times the actual speed, then when I continue my journey it goes back to normal and has no effect on the rev counter. so my question is: Is it a sensor problem or is it a direct drive cable and how do I repair it. the vehicle is a '96 plate sportrak efi .
Many thanks in advance

Phil