On 25 Jan 2005 13:52:45 GMT, (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 ______________?

Not familiar with the "new" 170-twice. But in other similiar IO-360
installations, it can be measuring the line pressure between the fuel
servo outlet and the orifices in the individual injector nozzles.

TC