I've had the fuel sender in the tank replaced. But the fuel gauge still reads 3/4 full with the fuel warning light staying on. This prevents the ambient air temp etc to show on the dash. I have already tried taking the fuel pump and instrument cluster fuses out, then turning the ignition on (not the engine!). Turning ignition off and replacing the fuses to try to get the computer to reset. It works but only for a short while and then reverts back to the same readings. PLEASE HELP!!