Ebay. Tsunami makes it. Or www.darvex.com, i think they have some too.
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Oh so you like mine?
I told you, if you have a question, just IM me. lol
They are directed audio. They go for about $40 for the poitive and negitive battery terminal, per pair. Each have a 0/1, 4, and (2) 8 awg Slots for wires.
However, a little tip< Make sure you tape a clear tape or something like that across the bottom of the positive side. I had gotten a little bit of moisture in the gauge, from the underside, and has screwed up some parts of the Blue glowing numbers.
But i will say, Very accurate.
http://members.rankmyride.com/djtorello