Sparkbright

Gents, I know monitoring voltage is always a somewhat emotional topic here, but I'm going to post this up anyway :)

Not sure if the Abody community is aware of these, but I have been using these little guys on motorcycles for years now and they are solid.
The lates model now offers auto dim, so one will be going in my Valiant as well.
Install is about as easy as it gets, and they are reliable and dead accurate.

Eclipse Battery Voltage Monitor | SparkBright