Hi, there isn’t a VL.Phidget nuget yet. so what you did install is the official phidget API. with vvvv gamma you should be able to patch any of these examples:
https://www.phidgets.com/?view=code_samples&lang=CSharp
most of the code in the c# examples i saw on that page are console programs, since vvvv gamma runs a main loop for you, you have to be careful to put the code that should be executed only once on create of a process node or surround it with an IF or a cache region.
there is also a previous post that could give you some hints: From c# code to VL patch, using imported dll (Phidget22.NET.dll)