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A gauge pressure sensor measures a pressure at a port against ambient pressure.
A unidirectional differential pressure sensor measures a pressure at a "high" port against a "low" port.

Is a gauge pressure sensor the same thing as a unidirectional differential pressure sensor (simply using ambient pressure as the "low" side)? Is this just a matter of where your reference point is?

I'm guessing you could turn a differential sensor into a gauge sensor by using ambient as your "low" side. Can you turn a gauge sensor into a differential sensor by using a pressure port rather than ambient?

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A differential pressure sensor can be used as a gauge pressure sensor by leaving the low pressure port open to the atmosphere.

A gauge pressure sensor is unlikely to be effective as a differential pressure sensor. The atmospheric side of the sensor has no need to be air tight, so if you did connect it to a low pressure point, it would probably leak air in or out, causing an error in the reading.

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