The pic shows the pin layout for the factory switch.. The black text tells what function the pin serves.. eg. On Indicator (slit) is the internat light that comes on if the door is ajar or dashlights, the light in the switch that turns on when the dashlights turn on....

The red text tells where the leads need to be hooked to.
(The "pin switch/ground" one is for a second pin switch that will light the "On Indicator" when the rear door is ajar.. If you hook it to the regular "overhead light" pin switch, the "On Indicator" light will come on whenever ANY light comes on, making this an option)

Any other ???'s