I posted a couple of treads on how to do this and used Tron and IM as examples: https://pinside.com/pinball/forum/topic/how-to-make-flashers-or-under-cabinet-lighting-for-15-for-modern-sterns

There are some pictures if IM in there. Happy to take more photos if you need them.

This thread is on making the backbox LED panel: https://pinside.com/pinball/forum/topic/how-to-make-an-led-backbox-for-30-for-modern-sterns

Here is mine. Excessive, but awesome. The white strips are back lighting and the black are tied to the flashers. There is video link in the backbox flasher thread.

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Here is a video of a game. Things get cooking for the last minute when Jericho is reached.

Yeah. The harness is a killer when making these. This is what I've come up with as a partial solution. A protoboard that acts as a splitter. One set of plugs is coming from the flashers, then I can split to backbox, cab, under backbox, Arduino, etc.

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