How do fix my gas gauge 1990 Mazda Miata?

To fix the gas gauge on a 1990 Mazda Miata, first check the fuse related to the instrument cluster to ensure it's not blown. If the fuse is intact, inspect the fuel sender unit located in the fuel tank for any faults or debris. Additionally, verify the wiring and connections between the sender and the gauge for any signs of damage or corrosion. If these components are functioning properly, the issue may lie within the gauge itself, which may require replacement.