And finally, here is the voltmeter assembled with the Sunpro faceplate over the Coronet's ammeter faceplate.

Upon closer examination, the real thing that makes these 2 faceplates contrast is the fact that they are not nearly the same shade of black. The Sunpro faceplate looks more like dark gray. It might not look so bad if I could match the color, but I'd rather just get a voltmeter scale on the Coronet's ammeter faceplate. Hence my call for help!