It's really nothing special. I found an American made quartz clock a few years ago, new in the box, and in 04 I bought a NOS Camaro spoked hub cap. I made some spacers, a wood shim, cut an access hole in the hub cap, and attached the clock.
I can get a picture if you are still interested.

No Ric, I didn't rob the guts from your Camaro clock. Well, not all of them.

I'll be your writer/editor and get them all down on paper. I'll make sure I capture all your gestures and faces, maybe clean up the language a little. I think we got a gold mine here Tony. I already have a name for the book.