I'm about to travel 200 miles to Carlisle and my volt meter/gauge is bouncing between D and C. What does this mean and should I be concerned? It's a 1963 Chrysler 300 with a 383.. All original..

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1963 Chrysler 300 Pace Setter Convertible 21K mile survivor 1969 Dodge Coronet 500 1956 Desoto Hemi 1955 Chrysler C300