It is the bulb, mine is currently intermittent, when i get in if it is out i smack that side of the dash until it lights up.
I think i knocked it loose when i have the cluster out.
If that does not work for you it is the bulb that has blown.
Gotta love an E34!!
Originally Posted by BMR_LVR
So a synopsis of a normally operating fan clutch:
Engine stone cold - fan clutch engaged
Engine at normal operating temp - fan clutch disengaged (easily stopped with the newspaper)
Engine above normal operating temp - fan clutch engaged