Canvas is FlightGear's new fully scriptable 2D drawing system that will allow you to easily create new instruments, HUDs and even GUI dialogs and custom GUI widgets, without having to write C++ code and without having to rebuild FlightGear.
There is an instrument being in development. The main difficulty is that the font used in the original device is specific to the original device. Replace it with one of the "standard" fonts FGFS without sacrificing to authenticity it won't be possible. Therefore interested as it is possible to solve this difficulty.
Work on the font has only just begun. During the development of the instrument can be put "a non-standard font" in the directory Fonts, but for the final model (as a part of aircraft model) such a variant is not well suited.