I ordered an eb48 and a tekin rx8/1900kv t8 to power it. Obviously I will be running it on 4s. Is 12awg wire large enough to handle this setup? I'm pretty sure the tekin combo comes with that size wire but I bought some extra so I can run all black wire. I just want to make sure that gauge wire will be sufficient.

yeah 12awg is good.

12 awg will be fine, but I tend to usually run 10 awg with 8th scale stuff.

10awg all day long.