It is recommended to disconnect the Battery Negative whenever you install new wires in the car.
If you disconnect the Negative battery cable
correctly, an infinity of DTCs are generated in almost all units, the instrument panel looks like a Christmas tree. Just take a walk (250-500m) to have all sensors recalibrated, clear all DTCs (VCDS, VCP, ODIS, 11, etc), ignition OFF/ON, and everything is back to normal. Easy.
I have never removed the fuse box from my wife's Golf, I bought a used one from eBay
to study it, and thus FEED my dreams.
You can power your TPMS unit from another
+30 fuse. You must take into account not to overload the chosen electrical line that feeds other devices. However, it is better to create a new line with a new fuse.
I do not know if the signals from the TPM sensors would correctly reach a TPMS unit installed inside the cabin.
The TPMS unit should be positioned/installed slightly to the right and preferably at the rear of the vehicle so that it knows how to differentiate the distances of the signals received from each TPM sensor and so which wheel each is, although I'm not sure if this could be an urban legend

.
Better read pg 31-35 of this vw SSP.
https://drive.google.com/file/d/0B2nv91 ... ydiHcQhWuA (or other SSPs).
The way I installed my TPMS units (6R, Golf) everything works correctly, that is, if I inflate the left front wheel, the pressure of the left front wheel rises on the screens (IC, HU_AID). ... and the sensors are detected very quickly.
