General questions about plane making

[CaptainSpaulding]

Hello everybody,
I have some simple questions, useful to setup and organize the work of Plane Making.
 

1. Triangles: what is the average total number of triangles to make a plane that works also on low-end systems? I've read that it's around 1 million, is it a correct figure?
2. Animations: I've read that animated parts can be demanding in terms of frame rate. Is it correct?
3. Gauges: standing the point 2, is it a good practice to make all the gauges in 3D, using XP's 2D textures only for computers and numerical outputs?
4. Textures: I am on a relatively low-end system, equipped with a GeForce GTX 1650 with 4Mb of memory, thus I have limited capablities with 4K textures. What is the average total number of 4K textures that can be used for a plane? 

I may add more questions to the list as more as I get in deep with technical questions...

Thanks in advance,
Cap.S.