This was my first go at the MinimOSD for APM 2.5. The one thing I didn't realize is that this board is V0.1 and the latest is V1.1. I learned in setting this up that you need to have power supplied to both sides of the board if you want to update the character set. I ordered mine off eBay for $15 and it came from China. You can get them from 3D Robotics, but they're much more expensive:
You'll also need the FTDI cable to load new firmware and character sets.:
This is an awesome little OSD device for your APM 2.5 setup.