This would most certainly appear to be an electrical anomaly of some sort. The problem is not at the data source, as the speedometer/odometer and the tach/hour meter have different sources (transmission computer and engine computer). We'd suggest that you observe for anything else occurring at the same time, such as voltmeter fluctuations, is generator always running or not, does anything else flicker, such as dash lights, etc. Like they say, "we've never seen this before." And in this case, true. This is going to take some detective work and possibly a little luck to diagnose.
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