Sorry I didn't introduce myself properly before I blundered in to this forum asking about chonometric tach rotation. But I was in a bit of a tizzy over it and thankfully Mike and Trev got me straightened out and I'm on my way to getting the old A10 rat project on it's feet.
Anyway, I'm a Yank, but have sort of Brit blood (OK, actually I'm of Irish descent, if it matters) and I collect Brit motorcycles. BSA's are my favorite, and I have a few A10's, but only two of them are running. I restored one many years ago and don't ride it any more, but I just finished another as a rider. It's a rescued chopper that some idiot messed up long ago, but it's running for now and may well see restoration somewhere down the road. Gone are the hideous long forks and small gas tank, replaced with proper forks and an old correct A10 tank I've had on the shelf for years.
Thanks to you all for your help with the Chrono problem, and I look forward to stopping by now and then on this forum.