All it says is that sender units built before 1995 can fail early; if you
have replaced the sender, then this information does not apply.
What does the scan tool tell you about the coolant temperature? If it agrees
with the gauge, check the actual temp of the coolant with a thermometer; if
it is not up to temp, probable bad or mis-installed thermostat; if the
coolant is up to temp and the scan tool agrees, replace the gauge. If the
coolant is up to temp and the scan tool and the gauge agree that it is not,
you have a bad sender.
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