I know! I just had to set it to "DIE 13." Big thanks to Pugwash and his excellent 7750 day/date wheel tutorial. It made changing the wheels very easy.
I still have to epoxy the gen crown tube to the case, superglue the missing 3 o'clock gen lume marker on the gen dial, affix the gen hands, trim the stem on the gen crown, regulate the Swiss 7750 and finally wear it in good health! This one is going to be a keeper! Originally, my plan was to DLC the case, but I'll leave that for a later date.
Big thanks to Texski for the gen parts. I've had these parts since last year.