Your sensor seems to accept a 12-24 supply voltage and returns a 0-5 V result. This would
seem to imply that the sensor is generating its own regulated 5V voltage regardless of its
power supply. In other words, it is not relying on a regulated 5V supply being made available
to it, from the arduino.
You should use a voltmeter to check that you are getting a plausible voltage on the signal
wire going to the arduino.
You should then check that you are getting a plausible numerical output form the analogRead().
Then you can worry about the conversion to a value in pressure units.