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post #12 of Old 12-31-2009
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A shop manual should also tell you how to test the switch itself. Often that's either an on-off connection or a variable resistance (most common) and you can test the sender with a multimeter. Senders do go bad, and if that happens you just throw it away and screw in a new one. A gauge is no panacea, it can malfunction too. And if the sender is bad--the gauge won't work either.
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