ME Super had auto sync only with the AF160 or AF200S. See page 28. (There were later flashes that could do it too)
The basic AF16 kit flash (centre pin only) needed the exposure to be manually selected to 125X. See page 29.
Manual selection was not a real chore as it was necessary to read the back of the flash and set the aperture anyway. That WAS a real chore.
However, the AF16 was much better than the AF160 for curing the girlfriends' dreaded redeyes at the time because it came with a little cable that was plugged into the X sync socket on the ME Super (and MX too), allowing use of the needed off camera flash bracket. The AF160 & AF 200 did not have the sync cable. I don't know what year the X socket was dropped.
I still have 2 AF16 and one cable remains, and the old bracket from 1980 and a few AF160 & 200s. I modified one AF16 optically to quench right down to a flicker for fill.
Sorry i no longer have an ME Super, here is the MX with the AF16 and its cable on a bracket.
https://www.box.com/s/ybklr3tzqq23knkqmde2
I never did slow sync on an slr, I think those old flashes would be too bright. Might be possible with a AF360 etc in manual mode 4 stops down