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Re: amp gauge or volt gauge 2 prong wiring
Sounds like someone might have added those wires to repair a faulty printed circuit with a burned out trace. It would be a good idea to follow those wires back to make sure they have them hooked up to the correct black & black w/white stripe wires in the harness. As I mentioned earlier, it's not a big deal if they're accidentally reversed though ... it'll just make the meter read backwards.
I would also recommend taking a look under the hood to make sure the two 4 amp inline fuses that protect the battery gauge circuit are still in place and haven't been bypassed or eliminated. You should find one on the driver side of the radiator support near the voltage regulator. And the other should be over on the passenger side near the junction block by the battery.
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