I have a tag that gives me the Pressure reading off a transmitter in psig. I don't want to go through the hassle of creating another column to convert it to psia. So I want to make it so the values I get as an output are tag (psig) + 14.69 so that it will be in units of psia. I know I can use conversion factors fro multiplication and division but how do I add or subtract in PI Datalink? I believe using a filter expression would be appropriate, but I'm not sure how the syntax should be.