TPMS?
My CLK63 Black Series has tire pressure monitoring.
It does not display individual tire pressures for each wheel, but does notify you if there is a drop in pressure below some (unknown to me) specified percentage of a pre-set pressure.
You can access this feature by using the buttons on the left side of the steering wheel.
JDB
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If your TPMS doesn't show the actual psi and this TPMS works the same way as my bimmer, I think it's useless. Why? There was one instance when I forgot to check the tire pressure for like 3 months or so.... the original pressure (when I checked last time) was 32f/39r, and when I checked it again it was 28f/34-35r. ~4psi drop all around. The indicator still shows "green"

I think all TPMS may just monitor "sudden" drop. If it's just normal psi drop (~1psi per month), TPMS wouldn't catch it.
My '05 E55 shows the psi numbers... so while it won't give me any warning, it's easier for me to see the actual psi (even though my handheld tire pressure gauge tells ~1psi higher than shown
).
The TPMS on the CLK63 Black Series is designed to display a warning message if there is a deviation from a previously set baseline pressure. I have not seen the warning message displayed, so I do not know if the message indicates the position of the low tire, or not. It may just warn you that you have a low tire, and then it's up to you to get the gauge out and find which one it is.
JDB
Even more puzzling is Audi which does it the Mercedes way, while the VW Toureg does it the Porsche way. All three are essentially owned by Porsche.AS







