Outdated input, help

I was wondering if anyone cant help me out with using inputs for SteamVR 2.2 all the tutorials seem to be outdated.

Im trying to add a simple input inside of my Weapon class to detect when the vive trigger is pressed, when pressed it will call a function inside of the same class.

I get the gist of it but i cant seem to find any documentation on how to use the newly updated SteamVR system