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They are just placed in the charged side of the system. The density of the air in this section of the induction system does vary, but the nature of a hotwire anemometer coupled with a temperature sensor takes this difference in density into account. It doesn't need to know the pressure of the air - the pressure affects density and the density affects how much the air passing by the hotwire absorbs the heat out of the hotwire; i.e. the denser the air, the more heat it sinks from the hotwire. This is a simplified explanation of how a hotwire mass airflow sensor works but my point is that it doesn't have to directly measure pressure in order to function. Different aspects of the properties of gases are all interlinked - pressure, temperature, density, velocity, flowrate with in a cross section, etc - you dont have to know all of these parameters to know the state of the gas either statically or dynamically. The continuity equation and the ideal gas law allow us to determine other non-measured states of a gas by just knowing a few of the others.
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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