Speedometer - cable or sensor?

Having trouble with the speedometer on my 97 GT...just curious if the speedometer is cable driven or sensor driven.

Thanks!

sensor

did you put on under or over sized tires?
whats the speedo doing , is it not acurate or not working altogether?

Sorry for the delayed response - no, the tires are the correct size for the car...here's what the speedometer does..although it is extremely unpredictable.

When I accelerate, usually during a hard acceleration like an on ramp, the needle will work ok up until 45 or 50, then stop, then JUMP to 57, stop....then JUMP to 65....then start working again. If I give the dashboard a swift pound of the fist, then the needle jumps to where it should be and the problem goes away...til the next time I accelerate hard. Note: I have had this problem under smooth accelerations as well, makes it hard to pinpoint when it happens.

try unplugging the instrument cluster and bending any loose conectors at the harness a little to tighten the conection. if that doesn't help you'll probably need to send it out for repairs.