230+ is pretty hot to be running without puking... I would check the output
voltage of your instrument regulator. At idle, your (generator?) might not
be putting out as much voltage as it does when you're on the road, and if
your 10 volt instrument regulator is toast, then the temperature gauge
reading becomes more or less proportional to charging system voltage.
Just because your gauge agrees with the laser thermometer at idle in the
garage, doesn't mean it's correct at any other time.
Best regards,
Theo
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