I understand most of these instructions but what does "the lights are part of a twist base with a slot for a flat head screw driver" mean? Does this mean that the light bulb base is the Turn-and-Lock type? If so, what is the flat head screw driver needed for? Should the car battery be disconnected before changing the cluster backlight bulbs? Thanks, Lexucan LEXUSCAN COULD YOU TELL ME HOW MUCH IT THE GAUGE NEEDLES COST AND IF YOU WERE ABLE TO GET THEM AT THE DEALER?