im fairly certain the haltech does not require wheel sensors. honestly, best bet is to speak to a nissan tuner about your options. my mate had a haltech with built in boost controller on a dial, he put it next to his gear shifter, and would go from low boost to full boost after launches. if your going all out, and changing cams and turbo, your going to need a new tune anyway. you could sell old ECU with current tune in it to offset some of the cost, and a lot of the newer model computers have options for plugging a laptop in real time and data logging. which is great for trouble shooting problems.
My sr20 im putting a PowerFC plug in computer, because i dont see the point stuffing around with nistunes and the like when a stand alone computer is not all that expensive. im not interested in the extra features that something like a haltech is offering. except maybe antilag. and that would be a bad idea for me to have, because it would get way over used.