Damn, what a wild time the 60s were. Astradome, the Space Race, Cuban Missile Crisis, slick looking cars...it had it all lol.
I do remember seeing your post back in 2019 about these gauges. I was actually hoping that by a stroke of luck, you or someone else might still have some European contacts that still had these gauges. Wouldn't mind an aftermarket repro at all but I've yet to hear back from the various companies that I've enquired about metric speedos for C bodies.