It is in my experience that the temerature sensors fail, and it seems that every 1984 D24 I have owned or serviced had this issue. I think they must've gotten a bad batch for a period of time or something. The guage would be very sensitive and would run close to the top of the gauge. You can try swapping the gauge sender with the glow plug sender in the back of the head and see if it helps. It may simply be the sending unit. I would try that first if it were me given my past experience. Its worth a try anyhow!
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