What is the outer diameter of the threaded part, and will this sensor work with water?

Yes, it will work with water. I believe the outer diameter is 1/4" male NPT thread. That said, you can always use a bushing to adapt it to whatever you are screwing it into (e.g. make it work with a 3/8" NPT female fitting).

I want to use this for a lab experimental procedure: will I be able to retrieve the pressure data in real time?

That depends on what you mean by "real time." It outputs an analog voltage that is a linear slope ranging from 0.5 volts (or close to that) for 0 Psi up to 4.5 volts (or close to that) for the upper range of Psi per sensor (150 Psi for the one I purchased). I assume there is some minimal latency for the analog circuitry inside the sensor to convert mechanical energy to electrical energy, but on your end, as I'm doing, you'll need to use an ADC (analog to digital converter) to process the data digitally, which has its own set of latencies depending on processing speed, bit resolution, etc. For my purposes, it's close enough to real time since I'm using an arduino board with my main loop time of less than 20 milliseconds with several of these sensors, and other sensors.

How come my gauge is 20 psi off

Here is the speciafication for our item : Output: 0.5V–4.5V linear voltage output. 0 psi outputs 0.5V, 100 psi outputs 2.5V, 200 psi outputs 4.5V

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Description

Pressure transducer/sender/sensor 150 psi stainless steel for oil,fuel,air,water; 150 psi Pressure transducer/sender/sensor/Transmitter for oil/fuel/air/water; 150 psi oil/fuel/air/water Pressure transducer/sender/sensor/Transmitter, Our material is using top of line 316 stainless steel and high temperature auto-graded plastic.
Output: 0.5V–4.5V linear voltage output. 0 psi outputs 0.5V, 75psi outputs 2.5V, 150 psi outputs 4.5V;
Power:This Pressure Transducer power is 5VDC;
Pressure Medium:The gas and liquid which is compatible with 316L stainless steel / Electromagnetism Compatibility:EN50081-1; EN50082-2; IEC61000-4-3;
Package include: 1 pcs x150 psi pressure transducer;

pressure transducer /pressure Sender/ Pressure Transmitter, Our material is using top of line 316 stainless steel (not 304) and high temperature auto-graded plastic. Pressure Range: 0-150 psi Material :Stainless steel Output: 0.5V ¨C 4.5V linear voltage output. 0 psi outputs 0.5V, 75 psi outputs 2.5V, 150 psi outputs 4.5V Working Temperature: -40¡ª+125?C;. Works for oil, fuel, water or air pressure. Can be used in oil tank, gas tank, etc. Accuracy: ¡À1%FS; Thread: 1/8¡±-27 NPT. Overload Capacity: 2 times; Pressure Medium: The gas and liquid which is compatible with 316L stainless steel; Load Resistance: ¡Ü(supply power-6.5V/0.02A)¦¸; Long-term stability: ¡À 0.2%FS/year; Temperature Effect on Zero: Typical: ¡À0.02%FS/C; Maximum: ¡À0.05%FS/C; Temperature Effect on Sensitivity: Typical: ¡À0.02%FS/C; Maximum: ¡À0.05%FS/C; Shock Resistance: I00g; Anti-Shock: ¡Ü¡À0.01%FS(X,Y,Z axes, 200Hz/g); Response Time: ¡Ü1ms; Insulation Resistance: >I00m¦¸ 500VDC; Explosion-proof Class: ExiaTTCT6; Electromagnetism Compatibility: EN50081-1; EN50082-2; IEC61000-4-3; Wiring connector: water sealed quick disconnect. Mating connector and wire harness (pigtail) is included. Wiring: Red for VCC,Green for output,Black for GND. It is an advance pressure sender than traditional mechanical pressure sender. Package include: 1 pcs x150 psi pressure transducer

Brand	AUTEX
Material	Stainless Steel
Style	Modern
Maximum Supply Voltage	5 Volts (DC)
Measurement Accuracy	±1.5 psi
Mounting Type	Flange Mount
Output Type	electrical signal
Response Time	1 Milliseconds
Specific Uses For Product	Industrial
Upper Temperature Rating	125 Degrees Celsius
UPC	702373916802
Manufacturer	AUTEX
Country of Origin	USA
Model number	GSND-0556629788
Number of Memory Sticks	1
Special Feature	Pressure transducer/sender/sensor compatible with oil, fuel, air, water
Item Weight	59 g
Package Dimensions	10.2 x 5.4 x 5.1 cm; 59 g
Item model number	GSND-0556629788
Are batteries included?	No

AUTEX 150 Psi Pressure Transducer/Sender/Sensor 150/200 Psi Stainless Steel 1/8ââ‚¬Â-27 NPT Pressure Transducer Sensor Compatible With Oil, Fuel, Air, Water

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