... I would like an amp hours left gage. Anyone have a source?
The most commonly recommended hour counter, and one that I use, is the Bogart TriMetric: http://www.bogartengineering.com/content/trimetrics (Handy Bob swears by this one and most of us swear by him.)
I also use a Blue Sky IPN Pro Remote: http://www.blueskyenergyinc.com/products/details/ipn_proremote (Handy Bob swears AT Blue Sky but I have had very good results for two years now.)
After watching the two meters track for two years, doing it over, I would simply go with the IPN Pro if I were using a Blue Sky solar controller. (I assume that Morning Star have a similar product.) I suppose that there may be something to be said for a totally independent meter.
Finally, and expensive, controversial, but dead easy to install option is the Smart Gauge: http://www.smartgauge.co.uk Available in the US from Defender Yacht: http://www.defender.com/product3.jsp?path=-1|328|2289954|2289950&id=2388351 The great advantage of this beast is that it does not require a shunt. But many dismiss it claiming that it is voudou and can't really work.