I'm new to this forum so hello all

I used to have a Mk4 GTI but have been away from VW's for a while. Now hoping to return by getting a Mk6 GT... so impressed with the Mk6!
Anyway, quick question... one of the cars I'm looking at has parking sensors but only the RCD310 installed. If I splashed out on an RNS510 is it simply a case of setting up the visual parking stuff when installing the 510 or are there wires/connectors that will need to be put in place? I'm assuming with the RCD310 the parking sensors are just audible but is all the wiring in the right place to make them visual on the 510?
Hope that makes sense and any info would be appreciated. Just trying to decide between an older GT with an RNS510 'B' and visual parking all set up or a 6 month old one with parking sensors and an RCD310 with the plan being to replace that with a RNS510.
Cheers

ps I've had a search around for an answer and couldn't find anything but I'm under a bit of pressure to make a decision early this week so wanted to get some info asap!