Hello Paul,
Glad to hear you got it started, which I would say confirms it as having been converted to -ve earth. One of the advantages is that -ve earth cars rust less due to a property known as cathodic protection. A positively charged body, and salt on the roads in winter, are a pretty corrosive mixture!
As for the ammeter, its possible that it has simply been disconnected rather than reversed. It would be worth following the wires to it to see where they go if you can.
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