How do you fix gas gauge for a Plymouth duster 1974?

To fix the gas gauge in a 1974 Plymouth Duster, first check the fuel sending unit located in the gas tank for any faults or corrosion. Inspect the wiring and connections for any damage or loose connections. If the sending unit is faulty, replace it; otherwise, test the gauge itself for functionality. Reconnect everything securely, and ensure the ground connections are solid to complete the repair.