ok so their are a couple things that concern me and that i have some questions about with this car since it doesnt have an owners manual

1. the temp gauge isnt working, how do i fix that?
2. what does the circle with the 6 bars around it on the digital gauge mean?
3. how do you read the bar gauge in the middle of the cluster
3. what does the it me when it blinks 3 0 on the bar gauge and the oil light comes on the digital read out? cause ive put some oil in it... idk

just let me know this is my first audi so im not too savy in this area im used to hondas but trying to widen my area on car knowledge

thanks