Re: Now what to ghettocharge?
Like he said, they're batch fired. You can use as few of the injectors as you like.
Or rather, they SHOULD be. From what I understand they were individually fired up until the injector recall of the late '90s. (For those who don't know, there are 2" hoses connecting the fuel injectors to the fuel rails, and according to Nissan they should be replaced every 60k miles, even though you have to drain the coolant and lift the intake plenum to get to them. Most owners didn't even know they existed until the car caught on fire.) When we performed the recall we replaced all the hoses, injector seals, fuel pressure regulator, and we cut the individual wires to the injectors and installed a harness on the #2 and #4 injector wires that branched the current to all the injectors. Some of the stuff we did was optional, but at the dealership I worked at we always did the full menu because it maximized the money we got for the job and because it helped cover our tails when a customer with a black-smoke belching 250k mile 300ZX got their car back and complained that it ran like new when he brought it to us and that we needed to fix it.
All that said, you can batch fire anywhere from two to six injectors straight off the ECU and not worry about it.