Sekonic adapter for Yunguo YN568EX II

What adapter do I need for my Yungnuo EX 568 II, I bought a Sekonic 401-801 cable for my Sekonic 308 X U ight meter, will work on my Canon flash but not on my Yungnuo. Thanks in advance.

How do you trigger the YN 568II when shooting? With that cable or a wireless trigger?

It triggers on the camera hot shoe fine, I just want my Sekonic light meter to trigger my flash so can get a wired reading like it does with my Canon flash.

I mean if you are using the YN flash off camera and use a wireless trigger to trip it, then you don't need the cable. Set the
Sekonic to cordless mode, use the flash trigger to fire the speedlite, the light meter will read it.

Yep, that's true , I'll give that a try....Thanks.