I cannot check the release myself at this time, so I attach an older documet which is actually a PANEL.CFG file showing the required modifications in color.
Andrei
[EDIT] A few more instructions, for whoever is not familiarized at all with the FS aircraft configuration files.
1) Choose an aircraft to test the gauge with. The simpler the better, so I (kind of obviously) choosed a C172. Pay attention to the fact that there may be several variations of the same aircraft!
2) Locate that particular aircraft subfolder in <FS Root>/Aircraft (in this case it's the "C172" subfolder) and open the AIRCRAFT.CFG file within using NOTEPAD or equivalent for viewing (no need to change this file)
3) Within the AIRCRAFT.CFG file, locate the [flightsim.something] section that refers to the EXACT AIRCRAFT VARIATION you plan to use for testing. Within that section, check the corresponding panel folder (blank means the "Panel" subfolder, while any suffix like "ehm" means "Panel.ehm" subfolder)
4) Copy the gauge file EHMGAUGE.GAU into the proper panel subfolder, overwriting any older versions of the file
5) Within the same folder, change the PANEL.CFG file as shown in the attached example. Making a backup copy beforehand is recommended...
6) Ensure there is no other conflicting EHMGAUGE.GAU anywhere else within the FS installation, and particularly in the <FS Root/Gauges> folder.
7) Start FS and hope for the best

Notes:
- The above mentioned folders match a FS9 installation, and may be slightly different in FSX
- ANY change to a PANEL.CFG file is ignored until that particular aircraft is "loaded" into the simulation. If it is already loaded, you can select another aircraft (using a different panel!) and then select back the test aircraft whose PANEL.CFG file you just modified