Im planning on picking up an LL8 from an 06 trailblazer at a local junk yard. Ive been researching these cars for a while and it seems that the 02-05's have a picky ecu so Its best to get an 06+

My main questions about the swap are the compatibility issues. I would like my car to retain AC and use the factory gauge cluster with all needles working like stock. I would probably need to have a custom wiring harness made that uses both my stock nissan KA24 harness and the harness from the LL8.

Also, from my understanding EFI live uses the OBD2 port to flash the ecu, so i would need to keep an OBD2 port plug-in.

So when it comes to tuning, EFI can tune the P12 (2006-07) LL8 ecu to run boost, larger injectors, etc? I read a few cases where the P12 could not be read and i believe that is currently still being fixed?

Im also planning on running a T-56 manual transmission out of a camaro SS

Anything I have missed, forgot, do not know and should before this swap?