I designed and built a tachometer / shift-light mod for my Getaway that matches the playfield tachometer during gameplay. The machine also has a ColorDMD, PinballToys mountain, Mezelmods Donut Heaven, Diablo topper, and a few other changes. It's not as modded as some, but it's pretty much right where I want it. I'm pretty proud of that tachometer, so I framed the schematics and a couple spare circuit and hung them next to the machine.
Here's a video of the tachometer in action:
And a whole series of videos that document the entire design and build process:
https://www.youtube.com/playlist?list=PLZXypXzuz-W3Nu35rhYS4dh87afp_na9_