To display a sensor reading on the screen of the EV3, you must configure the Display block to allow sensor readings to be wired as input:
1. Drag a Display block onto the programming canvas.
2. Click the Folder button and select Text>Pixels.
3. Click MINDSTORMS (in the upper-right corner of the block), and select Wired as the text input.
4. Once you select Wired, a Text port will appear on the block. Connect your data from the Vernier block to the Text port on the Display block.