Could be related to your Engine to Chassis ground cable. This ground closes the loop to ground for all engine related electronics including the Engine Coolant Temperature sender for the gauge.
With an old corroded cable, the resistance between the sensors output and ground will be higher than normal and will give your gauge a feedback into the red. The temp sensor is a 1k thermister at room temp and drops to around 200-100 ohms around normal operating temperature. If a poor engine to chassis ground cable connection is in the system, you will have inaccurate temp feedback from the gauge.
Another possibility you should check is your SI board batteries. These tend to die after 20 years and can leak and destroy the SI board. Pull the cluster and inspect.
Hit me up if you need ground cables or SI battery replacements, I perform both repairs for good rates.
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With an old corroded cable, the resistance between the sensors output and ground will be higher than normal and will give your gauge a feedback into the red. The temp sensor is a 1k thermister at room temp and drops to around 200-100 ohms around normal operating temperature. If a poor engine to chassis ground cable connection is in the system, you will have inaccurate temp feedback from the gauge.
Another possibility you should check is your SI board batteries. These tend to die after 20 years and can leak and destroy the SI board. Pull the cluster and inspect.
Hit me up if you need ground cables or SI battery replacements, I perform both repairs for good rates.
__________________
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