Massive caster variance Side to side

Going to throw this out there as the all-star one is the one use. Got caught up in the same type of reading issues but it was as kerndog post shows it was not following on right side start right out zero then back and left side left out then zero and back. Also I just tape my steering wheel at the top,go one and a half right, zero then three back the other way. Keeps the degree thing equal both ways from straight ahead.