Where is the odometer cable located?

Not sure what kind/year of car you have. The odometer and speedometer are both driven by the same cable. The cable goes forward from the back of the speedometer, throught the fire wall and down to the transmission. You should be able to see where the cable protrudes through the firewall. Some cars use an electrical transducer instead of a cable. The transducer is mounted in the transaxel, has an electrical cable and connector going to it, probably two wires. The speedometer on this system is electronic and receives an electrical signal from the transducer. There is nothing different looking about the speedometer to immediatly indicate which system you have. Good Luck