One source for the vacuum plating would be..
www.cvvacuumplaters.com
There are other sources for "general" dash restoration. Just Dashes would be one of several.
It would be my belief that the 4 smaller gauges surrounding the speedometer (turn signals, emerg. brake light, etc.) should not have the vacuum plating for the 70-72 Chevelle SS. Another questonable element for this 410 mile car.