billie:
Most of the pumps had the insides left natural on the pumps. That is, whatever color they were painted by the actual pumping unit manufacturer - not necessarly the gas pump manufacturer.
I've seen pumps where everything inside was the factory color (usualy red) or where just the frame and base parts were painted and the VR unit and pump itself were different colors.
Most of us (not all) paint the insides a different color from the outer sheetmetal for contrast. It all depends on whether or not you are going to show off the inside or not. Most of the time you will have the doors closed and the pump lit for display.
If you need any further info - drop me a line and I can send you some shots of my last restoration before the skins went on.
Later . . .
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