I just pulled mine out of storage...the three settings are (clockwise):
degF/12h
degC/12h
degC/24h
So if the one you pulled is 30/36/90, set it to the first one. Part number is 1 377 803
I'd toss two new bulbs in before you install it...they're the same as the ones in the dash. There is also a 'light bar' that might have burned-out bulbs. I think that 6vdc Radio Shack bulbs will fit. I'd be tempted to find some BMW color LEDs and install them with proper resistors. I've seen that info somewhere out there.