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Hello,
On the many cars that we have worked on that the accuracy of the temperature gauge was suspect, the only reliable way to check the gauge is to use a known good gauge to verify.
On old cars, this can be easy, but on a 240, the sending unit is hard to access.
However, modern technology, probably from NASA, has developed "non contact thermometers".
Most non contact thermometers are a point and shoot tool that can measure the infrared waves and can determine the temperature.
Most of them have a laser to help you aim.
Cheap versions are available for around $40.00 and they can be a useful tool for all kinds of things besides automotive.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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