Adding VFT to a genny without one...

Normally this would plug into a harness off the main breaker for something like the Wgen9500. Well, my 4650df doesn't have a main breaker ahead of everything, or a harness plug for this VTF. So while I have the skills for wire work to add an accompanying female plug. I'm at a loss as to how to best use this VFT, short of trying to maybe come off one of the two (20/30a) push pin breakers.

But I've yet to crack the panel to expose all the harness crap.

So ya, summary; What would be the best way to use this VFT on a Wgen4650DF ?

Ty.