FWIW, I just purchased two LED meters and voltage regulators from cold
fusion. One of my meters arrived with a missing wire, so I contacted the
company, who in turn wanted to see a photo. I sent a photo to them, and
three days later I had the replacement part. They also responded to my e-
mail within hours.

The flip side to this is I contacted them about some presales questions
and got absolutely zero response. Having service after the sale, to me is
more important though.

I think these meters are a little overpriced, considering you have to buy
a voltage regulator, but I think you're also paying for the small size.
I'm going to mount mine in front of the sink for my auxiliary battery.
Still torn whether or not I want to put one up in the dash for the main
battery. I don't think I would want to stare at a red LED all the time.

I guess an alternative would be to mount two of them in front of the sink
or other location, and then use a DPDT switch to go between the two.
Keeping an eye on both batteries to me is really important. Generally when
one battery starts to go, it draws from the good battery, and you end up
killing both. Catching a problem  at the first sign, could save you
dollars. Catching a bad alternator can also save you from being stranded
as well.

Overall, I think these meters are a good investment.

Best,

Troy
89 Vanagon