Map Light/Rear defogger

Good Morning,

I have a couple questions on a 71 Duster about a map light and rear window defogger, the owner before me changed the dash frame out due to the original being hacked up for a car stereo. I bought this car just based off pictures and did never asked the owner about the map light, if it was original or added later.

It has a switch on the left side of the dash, picture enclosed, could anyone point out where the light is located if you have this switch on your car?

Also I am installed a rear window defogger and if anyone has that setup, where would I located the toggle switch to operate that? Would it go nect to the map light switch? I am adding this to this car as it did not come on it originally.

Thanks in advance,