Was that old valiant speedo pegged? Must have been going downhill with 40 foot lane stripes! The hotter your motor runs
within its range the better it operates. you may lose a little power running it hot but mine always seemed to run better....right before I lost a lower rad hose. Then it ran
really good for about 30 seconds without the water pump drag! between 160 and 200, the OHM value is about 20 per 10F so if your Ford was running 10F under the guage, splice in a 20 OHM resistor. The lower your temp is the larger the range between 10F OHM measurements. On a graph it would be like this GM graph
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