Once you have used a DRO equipped lathe you'll be amazed how much easier and faster your work will be. I added one to my lathe in 1976 and haven't been without one since. No more mental mathematic gymnastics, counting dial revolutions, worrying about does this lathe cut 1:1 or 2:1. Get the DRO you won't regret it and will wonder how you ever got along without it. My DRO of choice has always been Southwest Industry's TRAK, you owe it to yourself to check it out. Feel free to PM me if you have any further questions, I am a Gunsmith/Toolmaker with 40+ years of experience.
How effective is a DRO for threading?
