Hyundai Repair: transmission problems, vehicle speed sensor, speedometer cable

Question
would the speed sensor cause the spedo to stop working in a hyundai accent

Answer
A defective vehicle speed sensor would cause the speedometer to stop working.  A defective input or output speed sensor (aka pulse generator) would not.  Depending on the year of your Accent, you may not have a vehicle speed sensor.  Older models used a speedometer cable rather than a sensor.