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The bore size of the cylinder and the load it needs to overcome are the 2 factors when figuring PSI. As a base rule, a 1" bore will produce a 1 to 1 ratio, meaning that if the PSI is 25, it will yield 25 lbs. of pressure on the load. The PSI to load ratio increases with a larger bore size, it decreases with a smaller bore size. That being said, the compressor you posted has plenty of PSI, but that's only half of the equation. The volume of air needed to operate the cylinder is the 2nd part. That's where the 3 gallon compressor may or may not be sufficient depending on how often the cylinder is activated.
