Two of those pumps will work well. Use one for the motor and one dedicated to the spray. I think the best way to go(for serious nitrous applications) is a fuel system with a large enough pump to handle both that has a return line. You will need a purge circuit and a switchable timing retard box. As far as safety items like a system disabler in case of low fuel/oil pressure, ect-we never used any as they can malfunction and make you lose races. Others may have a different opinion. Getting the timing and jetting correct is your biggest challenge. You may want to get some help from someone knowledgable with your deal. All of the major nitrous equipment manus have excellent stuff and IMO there isn't a lot of difference between them. You may want to get something with some adjustability in case you want to step up in the future.