Thanks guys. The idea of being on center is reinforced, though, I like seeing the light switch. It is part of the "really old motorcycle" feel of the thing, as I believe it is the original switch. OK, it's just there to turn on the lights. There is a bigger problem described below.
The contr-ah-versy (British English?), goes to something I've failed to mention. Harkening back to '73 (when I bought it), '79 (when I wrecked it), then '03 when I started to rebuild it, I had no idea what constituted original for all parts. After having the headlight ears rechromed and buying an A10 top tree, I went to put the forks together to discover that the ears were an inch too short. What I didn't know was that the bike, as bought in '73, had an A50 top tree and ears. Not wanting to throw out the expensive chrome job and pay for new ears, I bought an A50 tree, as shown in the photo. Ipso facto, no instrument mounting holes and the lock is on center. So, I think I might need a mount that goes under one of the top fork nuts.
I have included photos of the tree and the custom lock plate I made to compenstate for the on center lock. Every speck of dust looks like a major flaw in these photos. By the way, is there any way the dropped-end tree was used on A10s. I think it must have been a later developement.
Finally, if anyone has a single off-center speedo, it would be great to see a photo.
Richard