No need for the ADS-B Logger if the iFly 740 is not connected the ADS-B. It's just an additional logger to help see if the ADS-B data flow might be causing a conflict or such.
You can turn the 740 on without being connected to the ADS-B without issue, but there is just no benefit running that special logger with out that active ADS-B connection.
I hope your plane gets out of annual smoothly and back into the air. Have a great week.