Voltmeter in 1g

I was wonderin how to hook up my voltmeter, I keep searchin but its not bringin anything up.

isnt there directions that came with the meter? and what brand is it? i have never hooked one up before, how many wires does it have coming out of it?

Its a sunpro gauge. I got it for free when my battery wouldnt charge and now that it is i wanna be able to make sure its chargin (runnin stereo, amps, subs). But no it didnt come with instructions. And it has 2 wires comin out of it.

well there ya go... one to a acc wire and the other one to ground! Black = ground... the other wire should go to a accessory power wire that only turns on when the key is on!

well i knew where the ground had to go, but i wasnt sue about the other wire.

yea hook it up to the acc. wire that way you wont drain the battery once the car is off!