First step is to find the EQType for the Mana Bar from
this list.
Next step is to find where in your XML the Stamina Bar is. (The easiest is to find the EQType for the Stamina bar and search for it.)
Last is to change the EQType from Stamina to Mana.
You have to repeat the above for all the different parts. So that means the gauge and the percent number.
Hope that explanation helps.
Attached is the modded file.
Weskat