Nitrox and Octopus

I was following the discussion with regard to switching between air and Nitrox with the primary regulator but was curious about any issues related to an Octopus. Bottom line is it would seem to be best to have a completely different regulator/octopus/gauge setup for Nitrox. I was planning to do a Nitrox cert with my Advanced Open Water cert but am now having second thoughts as I wasn't planning on investing in any additional equipment just yet. Thoughts? Thanks.