What causes 95 Nissan 240sx odometer and trip meter not working?

The odometer and trip meter in a 1995 Nissan 240SX may not work due to a faulty speed sensor, which measures the vehicle's speed and sends information to the odometer. Additionally, a broken gear inside the odometer mechanism or a malfunctioning instrument cluster can also lead to this issue. Wiring problems or poor connections can further contribute to the failure of these components. Diagnosing the exact cause typically requires checking these components for damage or failure.