You shouldn't trust the indicators. Use a feeler gauge to determine the gap, and check it across the width of the rollers. I use a gap of around .038". Some people go as high as .050" (barely breaks the husk) or as low as .030" (very floury grist) but the vast majority of people settle on something in the .035-.040" range. Or you could just do trial and error, starting with a wide gap and closing it until your grist looks good, but the feeler gauge method is easier to check periodically and ensure the gap is consistent across the full width of the rollers. It WILL change over time as the bushings wear.