You do not need the dial indicator, however you will need a case neck micrometer. I have the K&M dial indicator and a sinclair case neck mike(www.sinclairintl.com
) and use the mike more often. Dial indicator makes it hard to hold and turn, but you can use it that way. Sinclair has several or Darrel Holland has one much cheaper for $65 www.hollandguns.com.
However recommend that you get a power screw driver with the versa batteries (2 extra) (one lasts 20-35 cases) and the sinclair driver and caseholder set ($44.50) that fits in end of screwdriver. Use FP-10 (sinclair $5)as lube or something similar on mandrel and inside necks. Using a power screwdriver will give you much smoother and cleaner cuts.
Recommend that you recut them after first firing to take off any ridges that pop up. They will be there.