My AEM UEGO will not match up right under any sensor settings even if it’s grounded at the same spot. Many people have had this problem I have and there isn’t many solutions with the UEGO other then using the custom wideband table in TS. I have done the calibration table and have gotten it to read exact numbers. My numbers were off by .2. Jean’s explanation on msextra is a good start, I too would prefer a digital signal over anolog anyday. Had mine for a while now without any problems.