CVBreard wrote:

According to the Cessna factory parts book, the original equipment gauge
is fed by a pressure transducer.


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Which is measuring the pressure of ______________?

Fuel, at the flow divider on top of the engine. This is called metered
pressure, as it is the fuel pressure downstream of the servo unit, just
before it enters the injector nozzles. As you stated, in this case, a
plugged injector, that results in a loss of total fuel flow into the
engine, will register as a fuel flow(pressure) *increase*.

Happy Flying!
Scott Skylane