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Congratulations on your purchase and welcome to the forum!
I'm concerned about the needle fluctuating: in mine and all the other Phaetons I have had an opportunity to drive it's rock-steady on 14 after starting. This, combined with the interior lights also fluctuating only when the engine is on could indicate an alternator charging problem more than a low battery problem. The condition of the alternator can be easily checked by the dealer with the appropriate tools or by you if you have access to an aftermarket tool. In the meantime, I suggest you try the following:
- turn on the engine with the transmission in park, move the car outside and let it idle.
- if the instrument needle and/or the interior lights fluctuate, accelerate and keep the engine running at a steady 3,500 or 4,000 revolutions. If the needle and lights stabilize I'd definitely suspect the alternator.
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