Sam,
I think you are getting the different leads or probes confused with one another.
Allow me to put this into perspective:
For secondary ignition, you can use either a capacitive or inductive probe/lead for synchronization purposes. It doesn't matter which one you use. You are only using one or the other to know which cylinder is firing. If you didn't have a sync probe hooked up, you wouldn't know. Now, there are other ways to achieve the same thing, but let's avoid that right now to keep it simple.
Quote:Is there a synch lead in the QuadKit?
Yes. This would be one of the four capacitive probes supplied in the kit. It is your option to purchase an inductive probe, but it really isn't necessary to parade a secondary ignition pattern without it. You can use the capacitive probe for that.
Quote: (would the 60A or 600A clamp work?).
Not for secondary, but yes for current readings you might want to use for sync such as injection. I prefer to go the standard voltage test lead for that, still though, you could use it for sync in certain situations.
Quote:what would be a good place to start learning about scope use?
You already found it. Ask lots of questions. We will help you out. That is what we do.