5 speed harness is the easy way to do it, they should be able to run 4 wires to make it work though (VSS and reverse lights)
even with the 5 speed harness you still have to do some wiring though.
here is a link to the article i followed, i didn’t have any problems. http://www.nicoclub.com/articles.php?id=183606
good luck.
I gave the shop a lower wireing harness that i got from varun yesterday…and they say it already has it ? man im geting pissed off…like what elese is there to need i dont understand what they want are the plugs not there to plug into on the automatic car? like …this really makes me mad now i thought i had all this ship covered acordingto the how to guides on the net …it doen really say wireing is that much of a problem…
Seems they finally got it under control …nvm about this.
they sound like they don’t know what they’re doing, the wiring is damn simple.
http://forums.nicoclub.com/zerothread?id=77784
scroll down and you’ll see the wiring, if you can even call it that 
It’s 2 wires that need to be shorted for the inhibitor switch (so you can start your car) and the other 2 are for your reverse lights.
Well picked up the car this morning all seems to be in place good 5 speed takes getting used to thats all…lolit was a bit more moeny they i got quoted …so that kinda sucks…but i gues its worth it…its a bit more i got them to change the diff and tranny all sinthetic fluids