On an SESG, the 35 wire pinout connection on the back of the radio has nothing connected to it; in that respect it's the same as any non-Ultra, non-CVO fairing model. And the 6B connector on the SESG has nothing connected to it either; the same as a non-Ultra, non-CVO fairing model bike.
It's only when you want to add XM, CB, rear speakers, NAV, and so forth that the NUOH is used. The NUOH is like an extension cord with one end, if you will, connecting to the bike's 35 wire pinouts on the radio and the 6B connector, and the other "end" consisting of the various connectors that the XM module, CB module, rear speakers, etc. are connected to. On an Ultra, the 35 wire pinouts of the radio has a connector plugged into it and the connections for the CB, rear speakers, etc. are connected to a harness that is already on the Ultra.
The SESG2 already has a 35 wire connector plugged into the back of the HK radio for the Ipod module (but uses only 4 or 5 of the 35 wire slots available compared to the 30 or so used in your NUOH for adding on the XM, CB, Etc.) and has no provision for adding XM, CB, etc. like the NUOH. To use the NUOH for the XM on the SESG2, you'll need to disconnect the OEM 35 wire connector, remove the 4 or 5 wires in it (used for the Ipod module), and reinstall them in the NUOH's 35 wire connector (since there is no way to connect the NUOH 35 wire connector while the OEM connector is attached to the radio and is what the Ipod interface module accessory instructions call for when installing the module on a bike that already has a 35 wire connector plugged into the radio) and (I believe, but don't know for sure) replicate (since the SESG2 doesn't have one) the 6B connector needed by the NUOH.
Carl
.