I don't think that's necessary. It doesn't always have to be an episode of 'sliced'...although I did enjoy that show thoroughly. ?I did some digging into how "Pressure Transducers"operate. Here is what I found:Until some one opens one up we will not truely know.
I knew there was something different just from the eyeball test, so I started reading into the different types of sensor and how they work. Basically, the old sensor is a "sealed" sensor. It does not use an atmospheric reference point, as the new gauge does...indicated by the hole on the side.
The "old" gauge seems to be what is called an "absolute pressure" gauge, meaning that it is measuring lowside fuel pressure, referenced ONLY to its sealed, vacuum housing. The new gauge is either a "differential pressure gauge", or, more likely, a "gauge pressure" gauge. (Their terms, not mine...and you can read more about each in the link). The problem with "absolute pressure" types of gauges is, and I quote:
"The major drawback is the trapped volume of air is sealed in and becomes is sensitive to temperature changes; both ambient and pressure media. When sealing a volume of air in a chamber the “Ideal Gas Law” presents challenges that are unavoidable. When talking about the ideal gas law as it pertains to a sealed gauge pressure transducer, the trapped volume of air expands or contracts with temperature changes and has a direct effect on the force applied on the backside of the diaphragm. The initial force on the back side of the diaphragm increases or decreases based on the direction of the temperature change. The lower the pressure range the greater the impact it has on the sensors overall accuracy "
So the "reference port" is ABSOLUTELY INDICATIVE that the old lowside fuel pressure sensor is not working in the same manner as the new one.