Shouldn't need to cut wires at all?
Go from the fusebox to the panels under the seatbelt, and fit an RCA converter under there too (unless your headunit has RCA)
Unless I'm misunderstanding your question.
If you're not confident then the guys at Autobarn will do it for 120$. But It's cool doing it yourself. Although it can get a bit messy. You have to make sure you're running the cables very neatly to the boot.
There is a dedicated site to the RNS 510. Maybe you'll be able to find your answer there:
.::MFD3::. - A Dedicated Site To The RNS-510 VW Nav System
I look at my V-Dub, and all I can think is....."Dat Ass....."
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