On the dic, it will allow you to switch to metric, it also controls the hud. Its labeled eng/met if im not mistaken
when you go the LED route does it still dim with the lights or is it on full strength at all times?The dic is gonna be a bulb. There are like 3 bulbs that backlight the display, you can either replace them with normal incandescent, or go the led route, which would be better, brighter.