[Phantom]

I know that it would take more circuitry and work but if a EGT sensor was installed to monitor the temp and when the temp reaches X amount switch back to the standard O2 readings. This would be accomplished with a low power relay that would have the EGT lead ran to the coil side where the when the voltage reaches the point to activate the internal switch it will bypass the efie.

This assumes that the EGT will increase in voltage with temp if not then the function will have to be reversed. The only other parts that might be needed would be a diode, resistor, and maybe a variable capacitor. Those would be just to help set the switch on/off point and prevent feed back.

I'm at work so I can not work the needed values or parts out that would fit it but the concept is there.