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I've had this very same issue with a 1970 Dodge Charger I used to own.
Turned out it was loose screws that hold the metal instrument cluster housing to the metal of the dash frame. Whenever I hit a good bump in the road or crossed a set of railroad tracks....POOF! out go the lights!
Tightened...
Make sure to check to see if a ground wire from the outside tube of the steering column is connected to the metal of the dash frame by where the column mounts to the dash.
Couple of things to check.....make sure that the screws holding the metal instrument housing to the dash frame are good and tight and making good contact to the metal dash frame, this is a path of ground for the running lights thru the main headlight switch.
Second, there should be a ground...