How do I get WD 10.12m to display the Sea Level pressure from a Radio Shack version of a WMR-968?
Try this page
http://www.tokaanuskihire.co.nz/wdhelp/offsets.shtml
Then obtain the sea level pressure from NOAA or a near by airport (METAR) and adjust the Barometer offset so your station reading matches that value.