I'm pretty sure i read somewhere that the volt metre works.. I'll have to find my source..
Well this isn't my original source but googling "s5 na gauge s5 tii t2 voltmeter boost" yields:
http://forum.teamfc3s.org/archive/in...p/t-23790.html search for volt and the second result will say the volt meter works just fine on a t2 (plug and play)