Theres no such thing as a stupid question, but I do answer posts on here at a fairly rapid rate so my short answers may appear as if I am irritated, but I am not!.
I've never had any experience with the Tech Edge stuff, it seems to be popular and well established.
The VEMS ECU doesn't have any outputs for the Lambda reading so theres nothing for any gauge to use.
As for an answer on the Borg-Warner turbo... I was planning on moving it to the Projects or Other chat section, and as I've not messed around with Turbos for about 3 years now I'm really not sure I'm the best person to answer, I'll see if anyone else can, but as this is one of the last weekends of the Summer season I know that a lot of people are away.