Running Press Soundboard into Spirit Meter

I know that someone has been able to put a running Press PKE Meter sound board into a spirit OKE Meter, but for the life of me, I can’t find any diagrams or even pictures of the wiring.

Does anyone have any how to videos, diagrams or pictures of the process or wiring to make that operation happen? Or, does anyone have a working link to either of those.

Please and Thank You

Here, this may help:

https://www.youtube.com/watch?v=u2fENk5VsrA

In the video description, there is also a link to the written instructions and also diagrams.

Before you attempt the mods, be sure to remove the batteries from the Spirit PKE meter. Good luck!!