IS RTD CHARM CONFIGURATION

Hi All, I am at one of our customer site. They using IS RTD(PT100) charms for temperature measurement. as per specification Pt100 is calibrated for -200 to 850 Deg C. I have configured XD scale as 0- 100 and OUT Scale as -200 to 850. This giving me actual field value, But customer does not want to see full range on DCS faceplate i.e -200 to 850 Deg C. Customer wants to see 0 to 200 Deg C. If I change out scale 0 to 200 its not reading proper field value. Please some one can help how can I achieve 0 to 200 Deg on faceplate with correct field value. Thanks.