The pressure sensor at UKBKB Spanish Fork (aka EW2355 Spanish Fork), has read wrong since I installed the weather station several years ago. I finally borrowed a Kestrel 4500 from work to apply a correction to my pressure sensor. As a result, I reduced the pressure reading on my Davis Vantage Pro 2 by 4 hPa.
You can see the change in the MesoWest time series plot when pressure decreased 400 Pascals:
http://home.chpc.utah.edu/~u0553130/Brian_Blaylock/cgi-bin/plot_ts_multistations.cgi?stn1=ukbkb&stn2=ukbkb&stn3=&stn4=&start=2017-02-13 08:35&end=2017-02-14 15:35&units=C&variable=pressure