What sensors are needed to use the MSD 6Hemi controller with a 32t crank 6.1L ? I've been told I'd need two 5.7 sensors and then one from the 4.7

Have you looked at the instructions? Bet they are online if you haven’t bought the kit yet, and it should cover it.

Wouldn’t be surprised if the reference to other motors is just because the same sensor works in those as well as a G3.