[Excaliber]

I have a modern vacuum advance MSD (plus mechanical advance) distributor. It's called (I think) the 'stand alone' model. It does NOT require a MSD electronic box to run, just wire direct to your coil/battery, or you can run it through an MSD box if you choose too. I went this route as a backup system should the MSD electronic box fail plus I wanted the vacuum advance unit as well.

Now George at Gessford CAUTIONED me about using the vacuum advance, he doesn't typically like these units and sold it to me somewhat reluctantly. The concern is getting TO MUCH 'total' advance under certain conditions as it's very hard to tell when and how much advance the vacuum portion actually supplies at any given time.

I researched the specifications carefully, hooked up a vacuum gauge I could read in the cockpit and tested the whole thing under various conditions. I'm happy with it, but like George, I wouldn't say it's for everybody.