Like Doug said, if you are able to read the gyro, getting it talking to the dashboard is pretty simple (although you have to build a custom dashboard - if you build and open your custom one before launching the driver station - on the same computer - it will use the one you made).
This tutorial:
https://frclabviewtutorials.com/gyro/
shows how to use the Smart Dashboard vi's to send the Gyro data to the dashboard (and get it to display) - your code will be different in that you will be using the example code to read the gyro and open the Gyro instead.