[Mondial]

If you want to stop the voltage surge on the pilot light, connect the two zener diodes (in series) across the pilot light itself. This will limit the maximum peak voltage across the bulb to 6.8 v. (4.8 V RMS which may make the bulb a bit dim). I would suggest using 9.1 V zeners which will allow the full 6.3V RMS ac volts across the bulb, but not allow it to go any higher.