I have a 1980 300TD with 190,000 miles. Runs great. I have never seen the low fuel light work. It has a bulb in the in the back of the cluster for it and I replaced it with a new bulb. The tank is almost empty right now and the light still doesn't illuminate. Is this a common thing or is there a possible easy fix that I'm not aware of. I don't NEED the light. I just would like it to work since it's there.