The choices are surface (wall) mounted, local (stem) mounted, flush (panel) mounted. When we specify that the pressure gauge mounting will be surface mounted it means it will be put on top of wall or any flat surface. Usually this mounting type is used when the local (stem) mounted (the tube from process line to gauge) couldn’t stand the weight of gauge.
Local (stem) mounted pressure gauge are the most used mounting type because the pressure gauge usually used to measure pressure in a pipe or vessel (no surface available). Beside that, we don’t need any necessary bracket to mount it at the field. Just connect it to the related process tapping.
Flush (panel) mounted pressure gauge are used in the panel that require a pressure gauge to be mounted there.