12v voltmeter by Smiths, bit scruffy as it been in my garage for 50 years. Still works, and would be an easy restore if you wanted an original part. It came off my Ashley sports car that I folded around a tree in 68
Smiths Classic Voltmeter - 11-15 Volts, 52mm Diameter, LED - Black Bezel
Car Universal 12V Voltmeter Meter battery gauge Gauge Voltage Tester Measurement
Smiths Ancillary Battery Voltmeter Volt Gauge Chrome Rim 52mm 2"
triumph TR7, TR8 75-81 NEW original Smiths voltmeter BV8115/00 8D1
Smiths Ancillary Battery Voltmeter Volt Gauge Chrome Rim 52mm 2" WC
Classic Car Cigarette Lighter 12V 1960s Austin Ford