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SPF put's their sensor in the radaitor, and their setup works quite well.
"Wouldn't one in the radiator petcock give irrelevant readings since it reads already cooled temperatures?"
If the coolant is allready cooled, the fan in not necessary, airflow is sufficient, no need to turn fan on. It's when the coolant is still hot in the radiator that the fan needs to turn on.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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