1985 chevys s6000 red button on dash
Me and my gf just bought our first bus and i drove it home and there is a red button on the dash that I have no idea what it does. It's a 1985 chevy c60 bus with a 366 and an auto. It looks like it has air lines running to the button and from the button it looks like it goes to the back of the transmission. Any help would be greatly appreciated!