Some reference info. There are instructions in the first link so that may help.
https://www.watchtalkforums.info/forums/thread161107.html
BULOVA COMPUTRON 229 DRIVERS N6 LED 1976
BULOVA COMPUTRON 254 DRIVERS N7 LED 1977
https://www.watchtalkforums.info/forums/thread161107.html
BULOVA COMPUTRON 229 DRIVERS N6 LED 1976
BULOVA COMPUTRON 254 DRIVERS N7 LED 1977