Voltage meter, voltage meter!
Key on if the battery drops below 11 Volt...
I have a battery voltage gauge on my UG, but it only gets powered in the ON position, which draws quite some power.
Got to work something out that reads voltage while only the lights are on.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
 lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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