[ERA Chas]

In the ERA, I have both, a digital volt and the SW amp gauge. I'm very comfortable using them both together for years.

Thanks for your interest and insights guys. Adjunct to the story: I just put a batt in street car #2 last week. It's a Bosch made by Exide. Get this-it sits outside all the time (teens to 30F) and holds 12.5-12.6V all the time...that's why I'm wary of the way this Megatron is acting.