yes you need a USB to serial adapter. They are all of $10. Wideband logging is not of much use if you cannot correlate that data to additional data such as RPM, throttle position etc... I would do the go-pro/cell vid gauge method on a carb and hopefully atleast get RPM in the picture.

however if you pull out a handheld video of your AF guage on an ODBII car, your tuner is going to hate you for it