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I have a 2002 Z06 with an interesting issue. Intermittently, and now more frequently than not, my gauge cluster indicators (the little green arrows) wont come on, however the exterior bulbs and the indicators on the HUD work fine.
I've done some research and I think it may just be a bulb however I cant find any specs/part numbers on it. Another possibility may be a grounding gremlin (my car has had electrical gremlins with the memory mirrors and other misc stuff since day one)
I had an intermittent issue also but it affected the dash turn signals AND HUD turn signal. The outside turn-signals were fine however. Turned out to be a mirror memory issue (broken mirror base plate).