My heat gage don't work I have replaced the sensor and thermosate what next?

If your heat gauge still isn't working after replacing the sensor and thermostat, check the wiring and connections for any damage or corrosion. You might also want to inspect the gauge itself for faults or consider testing the vehicle's computer for error codes. Additionally, ensure that the coolant level is adequate, as low coolant can affect gauge readings. If these steps don't resolve the issue, consulting a professional mechanic may be necessary.