The FirstLook is a great tool but is not a pressure transducer. It is a true pulse sensor which is piezio based.
A transducer will output a voltage that is related to a pressure so you can make a pressure scale that converts the voltage values to pressure values. 1mv/1psi for example. The FirstLook doesn't work this way.
The FirstLook only outputs a voltage based on changes in pressure. Any steady state results in a zero output so you cannot relate the voltage output to pressure values.
The FirstLook is a unique and valuable tool which has varied automotive applications and I'm sure could be used in many other applications.
A Fluke PV350 would be an example of a pressure transducer. This can measure positive and negative pressure and you can make a custom probe in PicoScope that scales the output directly in pressure units. This also has varied automotive application, but is a completely different tool for completely different purposes.