If we're talking about 432 hz as A, instead of A 440, you can tune your guitar down to 432.
You can also convert music recorded at 440 A to 432 A. That's the main point of talking about A 440 and A 432, changing the music, changing old music, making new music.
It's not particularly easy to find a free app that works well that you can use as a guitar tuner that will get you tuned to 432. I've tried one, couldn't get it to work well. Maybe there's a better one now?
I think youtube has some songs at 432.
I found this one, there are more, this is at 432