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What exactly does that mean - ie. what exactly would these two things give me, (...) Sorry, when it comes to electrical and audio components I'm quite a newbie...


If you are an electronics newbie, then these additional relay and sensor inputs and outputs do not give you anything. They are only useful to electronics and programming hobbyists who want to create their own special projects using those connections. This would require both designing the circuits of whatever was connected, and writing the software on the player to drive those circuits.

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Also, are there any other 3rd-party FM tuners that will work with the Rio Car, or only the original one and the PCATS one?

Only the original one and the PCATS one. (The PCATS one is a homebrew handbuilt replica of the original one.)
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Tony Fabris