Okay, so I tried to delete textures from b_osd.pssg to have only speed, gear and dial background (I deleted textures connected to revs and turbo), but unfortunately, my file went from 460kb to 2.5 mb and it didn't work as it supposed to had. So right now I know I need make these textures tranparent instead of deleting them (but idk how to make these things transparent, no skill with photoshop), but IDK if the size of file will be as it shuld be after the save. So if anyone have some tutorial how to do this, I would be very happy to do this on my own after some help. Thanks.
