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Hello and thank you for your question,Is the check engine light coming on and if so are you getting any fault codes?
Is the engine making any noise?
Im not sure you have any problem here, your oil pressure appears to be with in VWs specs. The factory specs at idle , should be 1.2-2.1 bar (17.4-30.4 PSI) of pressure. At 2000 RPM, there should be 1.6-2.1 bar (23.2-30.4 PSI) of pressure and at 3700 RPM, there should be 3.0-4.5 bar (43.5-58 PSI) of pressure.
23 to 30 PSI is consider normal at 2000 RPM. Im not seeing a problem here if your readings are correct. The pressure need to be measured when the RPM is steady, Yes 16 is a bit low but you stated it was at 25 PSI at idle. So now its at 16 PSI. If you are not getting any engine noise I do not think you have a problem here.
There are the Specs I have.At idle, there should be 1.2-2.1 bar (17.4-30.4 PSI) of pressure.At 2000 RPM, there should be 1.6-2.1 bar (23.2-30.4 PSI) of pressure.At 3700 RPM, there should be 3.0-4.5 bar (43.5-58 PSI) of pressure.
Im not sure with shop Key specs. Mine are VW specs.
Im not sure why it drop and Im not sure its a problem if it levels out at steady RPM.
Okay then I would check the signal and connection to them both. See the steps in the link below to do so. Copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/Oil%20pressure.%20Feb%2016.pdf
Okay then I am out of ideas. I can open the post back up for you if you would like, perhaps someone else may have something different to offer.