It 2001 JTEC, pretty simple settings, Low speed on/off, High speed on/off. Old T-Stat was 190 and that was what the tune was wrote for, but I'm deleting the clutch fan. I'm going to put in a 180 T-Stat and want to set up the fan on/off to match the 180 T-Stat. I don't think a 10 degree drop is going to change my tune.