The custom gauges are things like hybrid battery SOC, or the amps in/out of the hybrid pack, or even just an engine's short or long term fuel trims. Its basically any data that the engine uses. You just have to have the correct info to look for those codes. As Sentra pointed out, its not real easy to come by this info usually.
Another plus IMO for the SG is that it is made in the US.
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