I'm re-building a 1975 GL1000. There is a curious piece of aftermarket electronics under the left side pod cover. It is an electronic ignition box called "Dyna". I wasn't expecting to see this in this bike since it originally used points and condenser and coil type ignition. Does anyone know anything about this thing? What is it replacing in my ignition. Is it any good? Should I keep it, or try to rebuild the stock ignition the way it was originally. I like to have a stock look, but I don't care about any hidden stuff, so if this thing is good, I will keep it. By the way, I have never seen the bike running, and I'm quite a ways from testing the engine to see if it will run.