I have noticed something similar with my car, the top of the tach seems to be dimmer then the rest of the dash, I am guessing that it is just a burned out light since I seem to remember it being brighter. I would put a new light in but I am not really interested with taking my dash apart and it doesn't bother my that much
IIRC the dash is all on one fuse with the tail lights?
Son - 1995 Mystique LS Zetec 5-spd --> newest "mod" -> a girlfriend by my side
Father - 1995 Contour SE Duratec 5-spd
Mother - 1999 Contour SE Sport Duratec 5-spd
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