I currently have one of the digital volt meters from C&D technologies.
http://store.cd4power.com/cgi-bin/cd4power...67/Catalog/1042
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I do not have it installed yet, I am thinking of going another route. I have been looking at killing two birds with one stone. The temperature gauge on the 4th gen is next to useless in that you cannot really tell what the temperature is. I have been thinking about cutting out the factory temperature gauge and installing a multi-function digital gauge from Dakota Digital that can monitor coolant temperature and voltage. The gauge is 2 1/16" which is roughly the same size as the space the factory coolant gauge takes up. If this works out I may convert the entire dash to digital gauges. It would be rather expensive but, that has never stopped me before B)
http://www.dakotadigital.com/index.cfm/pag...prod/prd331.htm
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