Set fan operation switch

[CED567]

Hi, here is my question: my house 's central air conditioner has gas Heater and electric A/C, which fan operation I should switch in the thermostat? gas or electric? here are the manual instructions:
Set Fan Operation Switch, Move the switch to the proper setting:
- Gas or Oil: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).
-Electric or Heat Pump: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.

Any advice will be greatly appreciated, thanks

 

[ShaunCorbs]

Gas heat depending on stat

As the ac should bring on the fan automatically if it’s been wired correctly