Just throwing this out there for those of you that have '70 and up A bodies.
http://www.summitracing.com/parts/atm-2141/applications
http://www.summitracing.com/parts/atm-2141/applications
I may end up needing one of these. I'll definitely look around for that price, quality looks to be bottom shelf. $100 seems more reasonable for ABS plastic.
Here is a link to the Classic industries panel. They have Aluminum, ABS and carbon fiber.
http://www.classicindustries.com/shop/mopar/a-body-dart-sport/parts/?q=gauge panel