Replacing the OBC backlight
. <---Clicky clicky
That is for and E30, though.
And Hoff, to reset your OBC, there is a small button one the lower right side that you have to stick something small in to engage. If yours is reading metric stuff (liters, kilometers, etc) first got to Range (I think) and hit that reset button. That should change it to US measurements. If thats not the right one, its one of the ones in the middle column. Eh, you'll figure it out quickly.
To reset time/date, click over to the one you want and hit the reset button. Then you use the 1000 100 10 etc buttons at the bottom to set the time, then click over to date and do the same.