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Not sure, but I think as the rpms drop while coasting in neutral, the voltage level from the charging system is likely dropping also. In my Ranger, at 60mph, the rpms drop from around 2200 to 1000 when coasting(idles around 750). So even though there are various voltage regulators in the system(alternator, instrumentation, etc) the voltage to either the sending unit or the gauge could be changing. This is just a possibility. I've had the regulator to an instrument panel go bad before and make it look as though the engine was burning up because the temperature gauge was pegging.
JJ
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