hi guys, my speedo is not working, everything else is fine, where do i start to try and fix it???

If it has a cable check that first
Ray

a bit more info would be good
Make?
Cable drive or electric?
Magnet set up?
Etc

mk indy pinto
electric and im guessing magnet?

do i follow the wires and see where they go? i need to send the mileage cert back to the insurance guys too.