You may know this already but, generally the hissing you hear on when a compressor shuts down is the "unloader" valve. A check valve maintains pressure in the tank, the unloader valve bleeds off the pressure that is on the compressor head ... it does this so it doesn't restart under pressure and overload the motor.
The unloader valve bleeding off should not show up on any of the pressure gauges. If you have a large drier, or after cooler between the compressor head and the tank it will take longer to bleed off as it must also bleed down the cooler lines.
It's been my experience lately that it's very hard to get a quality pressure switch these days, and doubly difficult to get one that also meets your pressure cut in/out needs.
My IR compressor is great, but the pressure switch is garbage, but it's very difficult to find anything except OEM (over priced crap) that meets the requirements and also has all the appropriate in/out fittings etc.
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