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Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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Yes, you will see 12V. Yes, if you disconnect the OP sender, the gauge will peg. The sender is a varying resistance (basically a fancy rheostat), and at infinite resistance it won't bleed off some of the current flowing through the gauge mechanism to keep the needle below maximum.
So take Graco's advice and check the connector. If you still get erratic readings, probably best to get a new sender. Alas, they don't last forever.
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