Newbies have question!

[Driftvader]

Hello to all Subaru owner.
I'm Ken just own a subaru v7 sti, i have some question to ask the expert.
I don't know about Subaru so much, But I love it!

Here is the questions:
1) Is the R Diff Temp always lights on when start the car?
2) What is the Signal on top of the fuel gauge? Is it always lights on too?
3) What is the thing between the fuel gauge & Temp gauge?

Thanks