1995 Cadillac Digital Dash

Cracked solder joint on the printed circuit board. All of them do it sooner or later. You'll probably hit a bump at some point and it'll come back on. It's still counting miles, just not displaying them. The solution is to get to the back of the display and re-flow the solder with a heat gun or soldering iron. Usually not worth the trouble though, it will come on sooner or later. Outside temperature and length of driving time can both affect it.
 
My late and lamented 93 Roadmaster odometer started running backward for awhile...creeped me out a little, like that Stephen King movie Christine.
 
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