WG U5000 monitor for Killer instinct selector 15khz or 25khz?

[turbohao]

Hi everybody i'm new here and a total noob
i'm gonna try to install a U5000 Wells Gardner screen in my killer instinct kabinet
It has 2 refresh rate connections one for 15khz and one for 25khz horizontal
does anyone know if i need to put the selector in 25khz or 15khz?
and when i switch to the horizontal 25khz connection do i need to set the vertical also to 25khz?
i thought 15khz was used for older games,what would happen if killer instinct is made for a 25khz monitor and it's connected to a 15khz?
any help is welcome
thanks

[Kevin Mullins]

15khz

[turbohao]

Thanks Kevin