This is for a fic, sort of, but it's something I've been wondering for a while. How do you other writers work this?
How should dialect be approached in dialogue?
Write it out somewhat phonetically, so the readers can "hear" it.
What are you talking about, just use normal spelling and rely on readers' knowledge of the source.
Make sure any obvious syntactical differences are there and keep it standard otherwise.
Other, which I will elaborate on in the comments.