Yes. The Vac gauge is something that Tim and Dads50 convinced me to get in listening to the posts on it. Turns out it was a very good idea.
Dennis, that 5568 is really a nice light, amazing in its capabilities, more functions than I know what to do with. If this truck is the only reason you will ever need a timing light, maybe it's overkill. I got it because I will be diagnosing many vehicles over time.