Small bike mounted voltmeter?

[neatbik]

After having a few electrical probs on my bike recently, and winning, ive been thinking it would be useful to have a small voltmeter mounted on the bike so i can keep an eye on whats happening.

But the only one i can find is the Acumen one with the combined gear indicator...

Anyone seen one anywhere?
Cheers, Nick

[iooi]

Should be able to pick one up from the likes of Halfords. Or even a trip to a local scrap yard may see one in a car dash.
____________________
Just because my bike was A DIVVY, does not mean i am......