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Before replacing anything and wasting money unnecessarily, I would try some simple diagnostic steps. Most temperature senders work by reducing resistance as the temperature rises. A very simple check would be to just disconnect the wire at the sensor and see if the gauge goes to cold and stays there. It should not float at any other position. You can optionally ground the wire using 50 ohm resistor, or thereabouts, and watch the gauge. If the needle still doesn't move at all, then the problem is more likely to be in the gauge or the wiring between it and the sender.
You can also test the sensor using a multimeter by grounding the negative lead to the engine and probing the connector, with the wire disconnected ofcourse. The resistance should fall as the engine warms up. You may want to make note of the reading you get at cold, warm and hot to compare with what the service manual says it should be at.
KuoH
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