With the Meter Editor, both radial and linear instruments can be created. The basis of the editor consists of a scale which can be adjusted as desired. In addition, simple graphic objects (rectangle, ellipse), images, text or formulas can be placed. The Meter Editor also takes care of the placement of the pointer and the assignment of calculations (e.g. analog input).
The use of the Diagram Editor is explained in the uniTFTacademy. You can find the link on the right.