Like the other guys said....looking at the build logs and other posts on this site will tell you all you need to know. And, if you're stuck, a quick call to Mick Sollis or post a question on here and you will get the answer...sometimes more than one answer!
Co-incidentally, @IanAnderson posted a link yesterday evening to the GTD40 manual and wiring diagrams:-
Thought I would begin a thread to detail my building of a SouthernGT from Mick Sollis based near Southampton in the UK. Basically this has all come about after buying a GTD last June. After owning the car for some time I decided to start a slow upgrading to personalise the car as most owners do...
The build manual for the GTD is of no use. Neither is the wiring diagram for building the SGT. It takes alittle time like Paul said to get into things and once you understand its function and purpose it goes good. Manuals are just confusing, but I’m very lucky to have great friends with the same builds as mine.