At the request and suggestion of many of our customers SmartGauge has been re-engineered into a new flush mouhting case.
SmartGauge requires a cutout in the panel it is to be mounted to with dimensions as per the diagram below. These dimensions are the actual case dimensions. It is recommended that the cutout be made somewhat larger than this to allow (say) 2mm clearance on each side.
Note that the required cutout is not vertically central but it is horizontally central.
The four mounting holes are drilled from the back but not all the way through so you can leave them, if so desired, for a more streamlined front panel look.