Below is the correct location to install a "TIT" probe for the VNT TDI. This places the probe directly and COMPLETELY in the incoming exhaust stream entering the turbine inlet (Turbine Inlet Temperature = TIT).
I have taken apart these turbos and the only reasonable location to measure all four exhaust streams is located in the picture above.
Measuring from the EGR port is a complete waste of time and WILL NOT provide accurate temperature data. The reason is that the probe will NOT be completely exposed to the exhaust.
If you are going to spend the time to install a probe, take the extra 20 minutes and install it correctly...otherwise don't waste your time.