Can?t seem to get tire wizard to find correct adjustment. Current says 6.12 and gear ratio is 1.00. I actually tried several different sizes......20.3 was what calculator gave me and that made my Speedo way out of whack....I also tried setting my actual gear ratio at 3.73 which should be accurate and that?s a no go also. And small changes multiplier gives err and won?t let me change. So how do I actually get an accurate speedo if I can?t figure out the numbers on my own🤦*♂️🤦*♂️ Any help appreciated.