I have a 1989 TE which is similar wrt the illumination of console.
Assuming you have not dimmed out the lights with the 'pot' then -
If your fuses OK and you are confident bulbs OK then you will probably need to pull the instrument cluster out. At the rear of the cluster there is another fuse (like a red hat) buy from yr supplier before you start.
You will need to take out yr centre console trim, ashtray, wooden trim around stick complete (the bit with the switches in - in front of the carpeted tray) to change any defective bulbs. The ones in the vents are PITAs.
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K