Watching Shango work on TV alignment with a B&K 415 and it looks like he has the "To Scope Horz Input" connected to the A Trigger scope input via a simple dual banana to bnc connector. Video here:
https://www.youtube.com/watch?v=CmEyYAjjsn0&t=992s. Here is maybe a connector adaptor I could use:
https://www.pasternack.com/banana-ja...-pe9011-p.aspx
I'm still not sure when I would then also use the "To Scope Vert Input" coming out of the B&K 415.