You are looking for a problem that doesn't exist. In the real world home water pressure fluctuates.
If you think the gauge is incorrect, change the gauge.
Don't trust the pressure regulator? Buy a new one.
I'm deffinitely obsessed with my water pressure because I don't want to spend thousands of dollars repairing water damage due to a burst pipe or other pressure related issue...
Most all fixtures on the market are tested at much higher pressures than they would be subject to in the real world. ( I know because my wife spent 30 years working in water filter and irrigation manufacturing. Including home systems)
Just stay away from the cheep stuff you can buy online.
The fact is your plumbing is not substantially different than your neighbors.
If there isn't a history of plumbing issues in the neighborhood related to the water pressure, or for that matter the plumbing age or type, then relax.
You are not any more likely to have an issue than most of the rest of us.