DH-670 Analog DC Voltmeter - 100V 150V 250V 300V 450V 500V Ranges
Now available from PMD Way is this range of DC panel voltage meters. You can select from maximum values between 100VDC and 500V DC using the options menu.
The example image shows a 50V meter, however the scale will match your meter's range when ordered. Mounting hardware is included.
Face measures 60x70mm as shown below.