Just for the heck of it you might want to see if there's a separate fuse just for those dash lights. I had a drivers side high beam out for about a year(I never use high beams) so I decided to replace the headlamp, a no go. I have two whole light units for spares so tried replacing the whole unit, still a no go. Checked my fuse box and low and behold, I have a separate fuse just for the drivers side high beam and dash marker light(high beam).

__________________
1981 240d
Newport,RI