For a multipoint injection system you have to do both, although if you start with a memcal from a V6 it should have the dividers set right to start with. For TBI applications the memcal divider only has to be set up to divide by the number of injectors, either 1 or 2. From what I remember the 7730 has one injector output for all cylinders and would probably double fire the injectors (divide-by-3 on a straight six).