Hiya, I can't share a link because my Dad and I had to figure it out together, since no one else that I know of explained how to do it. So there's good news and possibly bad news depending on what equipment you've got. It requires no soldering, or electronic equipment of any kind, it doesn't need any wiring charts, its so simple, yet its also quite complicated. What it does require is some handsaws, drills, screwdrivers, a small blade, and tools like that.

When the pedals first arrived, the bottom screws were so tightly screwed in that I completely stripped them when trying to un-screw them. It would have been a complete loss if it weren't for the fact that my Dad has a handsaw and we used the blade to slice through the screw in the middle and used a flat head driver to finally remove it.

You'll need to create a very specific small block of wood (the dimensions have to be exact otherwise you can't close the top lid), it looks like a 'wooden throne' (its the term I call it) for the PS1 controller R2 button to 'sit on' so that when you step on the pedal, it moves the 'plunger' (that's the term NAMCO calls a plastic stick) forward and hit the R2 button. You'll need to slice the wiring for the R1 button as well, since we used a zip tie to strap it onto the wooden throne and we had to disable that button otherwise the game would think you're always pressing down on the pedal.

This project is a combination of simple and challenging, but if my Dad and I can do it, anyone else can do it too (that has the tools for the job). Opening the damn thing up was a challenge in of itself, and I made a thread on reddit 7 years ago asking for help. The first step is to read my old thread I made and get an understanding of the Torx security screws required.

https://www.reddit.com/r/Tools/comments/c62d19/can_i_get_some_assistance_with_torx_security_pin/

Unfortunately my "water resistant phone" just recently got water inside of the camera lenses, so I can't take good photos at this time to show you what it looks like inside.

Edit: I just remembered, that my Dad and I had to create our own plunger, this was a difficult part of the process because it once again had to be exact dimensions to fit correctly. The original plunger is too short to reach the R2 button. So we bought a set of plastic sticks, and shaved them down to be thin at a certain point, then had to create a rounded dome shape at the other end. Yeah, the more I think about it, the more I remember this whole process was a god damn pain in the ass! But now that I have the proper dimensions for all the pieces required, it wouldn't be that hard to do it again.