1 - Copy-Paste the .zip file to "X:\YourOrbiterFolder\"
2 - Unzip the file
3 - Check you have "fuelMFD.dll" in the X:\YourOrbiterFolder\modules\Plugin" directory
4 - Open the "Orbiter Launchpad" (double-click on Orbiter.exe)
5 - Click on the "Modules" tab or button (depends of the version of Orbiter you are using)
6 - You have two columns : "active modules" and "inactive modules". You should see "fuelMFD" in the "inactive modules" column.
7 - Select "fuelMFD" then click on the "Activate" button.
8 - Launch any Orbiter scenario.
9 - On the MFDs selection menu, you should now have the "Fuel MFD" entry. There is probably more than 1 page in the selection menu, so if you don't see it, don't forget to click again on "SEL" to get the next pages.
Works for me, hope it will work for you