TT troubles

Well, I've got some troubles with the TT. Instrument cluster may be bad, fuel sending unit may be bad, the turbo bypass valve is bad, and the backup lights don't work.

I don't have the time to futz with it, but am afraid of how many hours I might have to pay someone to get to the bottom of all these problems.

Here are the resources I was using:
hum at 2900 RMP: http://www.audittcca.com/faq/958411681
$100 repair manuals: http://www.bentleypublishers.com/product.htm?code=ATT5
$229 windows based VW diagnostic reader (goes beyond OBD-II): http://www.ross-tech.com/products.html
good forums: http://tech.bentleypublishers.com/forum.jspa?forumName=audi.a.a4&start=0
http://www.audiworld.com/forum/tt.html