Here is a quick tutorial on how to change the Horizon colors on the Mountain Wave DIY Avionics EFIS

This post assumes you can build the source on the device as shown here:

The Colors for the Horizon are stored in horizon_instrument.cpp

Use any text editor you like, I use nano. “nano horizon_instrument.cpp”

The two colors for the sky and earth are set with two RGB Combination here:

If we wanted to make the sky pink, we could simply change the RGB combination of the sky to 248, 24, 148. The last 255 is grey value – since we want full on pink, we’ll leave it at 255.

Now save the file, run qmake, followed by make, and run the application:

Now you should have a nice pink, apocalyptic sky