Looking to set up the Versus Billboard Commander

[mmmmaerk]

As seen here:
https://www.arcade-projects.com/threads/sega-versus-billboard-commander.3251/

What kind of connector does the input of the Versus billboard PCB use? It's the smaller 20 pin one on the bottom.

I messaged twistedsymphony asking what kind of connector I'd need, but his answer kind of went over my head. Instead of bothering him in DMs or necrobumping that project showcase thread, I figured I'll just ask here so someone else in my situation can find help later.

If you've got the 837-11854 board from a Versus City cabinet then the input is a 20 pin TE AMP connector (I don't remember what family) it looks similar to the JST RA but it's not the same. Then there is a 50 pin that is used for the OUTPUTs to the numerical displays.

Assuming I figure out what kind of connector it is, how should I wire it to the GPIO pins?

Thanks for your help.