Making a Threading Dial for my 1931 South Bend 11 #84-A

My lead screw has 8 TPI and I believe this method applies to any lathe with the same.
FYI - The saw was .080" but you could go slightly wider. The gear diameter was 1-5/16". I don't know if this is ideal but if you go larger the tooth spacing will be larger too. The Gear is 32 tooth for a 8 TPI lead screw.