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I have a old VW TDI that I have been experimenting with. Interestingly from my research they don't have a turbo pressure boost sensor, if they had it would be easiest just to tap directly into the sensor or the CAN network. It think that they calculate boost pressure using RPM and mass air flow sensor.
Ideally the easiest way to do this would have been to connect to the CAN and get boost pressure if VW had a boost sensor on the motor. I was able to do this on a Caterpillar large diesel engine using javascript and npm Can on a Beaglebone Black.
user7143
You could just look in a scrap yard? I'm measuring vacuum, but the GM sensors are great. 5v in and a basically 5v swing on the analog output. I'd guess the ones off turbo cars are very similar