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Old 06-27-2018, 09:01 AM
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Standard gauges are designed for 240-33 ohm sending units. 240 ohms is the low end of the range. It is entirely possible to have a 240 ohm sender, a 240 ohm gauge, and still be off. One example would be a 100 PSI sender on an 80 PSI gauge.
Another source of error can be a dual station sender with one gauge or vice versa.
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