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Water temp sensor

I have a late 72 Pre L with a 260 deg temp gauge. I don’t think the gauge is reading correctly. I’ve read that the system was inaccurate at best from the factory, and used a 10ohm resistor. I read an article by Bill Taylor suggesting removing that resistor and the sensor and replacing the sensor with either of 2 sensors he determined worked well with the original gauge. Problem is that neither suggested sensor is available anymore. Any suggestions on how to restore accuracy to my original gauge?

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