Bought a rather nice small LED voltmeter off Ebay for not a lot. It's a 3
digit type. For the old Rover which didn't have any battery indication -
intend fitting it in the middle of the rev-counter face. However, it's a
bit bright for night time. Any clues about dimming it? Can't get a data
sheet for it - came from the far east.
The PCB has a single processor and two regulators - one 5 volt and one
3.3v. I'd guess the latter is for the display. But being surface mount,
rather difficult to suss out the schematic.

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*That's it! I‘m calling grandma!

Dave Plowman London SW
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