Re: Wiring Voltmeter - Where source?
I'm sure you can wire both to the same keyed source if you want. They most likely have the instructions like that because it's a digital gauge and the battery connection to the display portion is "dead" until the gauge turns on via the key on wire. It mentions that it has some memory functions. Will those work without a constant hot connection on the blue/source wire (similar to the memory functions on a car stereo if the BATT connection is dead)? I don't know. Also providing a separate key on supply and source supply lets you decide where you want to monitor voltage.
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