Wow! Really nice. I used an automotive type voltmeter, the round one, that is not nearly so clean looking, but does the job. The meter panel includes some ammeters that are just for fun, not at all necessary.
To the left of the voltmeter are two toggle switches. The one on the right is DPDT with center off. Up displays battery voltage and down converter output. If the battery is connected to the converter by a separate battery switch the readings are the same. The switch on the left turns on/off ammeter backlights.
Bill