Fw: How to pin point strain gauge locations in an FEA result window?
The more accurate way I have found to do it is to create a surface region on the model the size of the strain gage and create a measure of the averaged strain in that region. That is essentially what you get from a strain gage -- averaged strain across the gage. You will also have to know the direction of the strain gage and assign the same direction to your Mech measurement.
Ideally, it would be nice to get a point value from a strain gage, but that is normally not possible unless the area under the strain gage has a very small gradient. Usually, we want to know the stress/strain in some tiny fillet with a large gradient. A point measure on a Mech model would always give you a higher (absolute) value than even the smallest, most expertly applied strain gage.