Hi Jim,
Are the roundels electroluminescent panels? Only thing is I didn't know EL polymer panels like we have today existed in that form in the 60s. Military secrets and so on aside, our modern EL polymers as we know them now are a lot different from anything previously made or that was possible to make 40 years ago.
Anyhow, if they are EL panels driven by an inverter that takes DC in and puts out a AC frequency that is proper for the panel itself. Now I don't now the specifics of these but I've messed around with various EL panels and have a couple of inverters about you could try if you wished. One is a small unit that runs on four double AAs (could be modified to run on 12V) and I think I have a couple of inverters that run on 12V too.
If interested PM me and I can send one up.
Ron