what does fuel rail pressure sensor circuit high mean on my 2005 ford escape? on 2005 Ford Escape

engine light on

Asked by for the 2005 Ford Escape
High fuel press. Sensor reading increases with pressure.Sensor mounted on fuel rail to reg. press.Scanner will
give readings.Dont think you can hook up fuel press.guage.
Is there any way to test a fuel pressure sensor before I go buy one?