Interior view of the meter and a parts list, from the manual.
https://awesome.garden/system/media_attachments/files/115/982/274/903/805/246/original/0a80ef43519d75cc.jpeg
It’s reportedly not working correctly, but assuming the gauge itself isn’t blown, I think I can fix it. Because this is from a time when tools were meant to be maintained. The manual has a full parts list and schematic.
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