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Q: Check gauges on 2002 Chevrolet Trailblazer

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just noticed that my check gauges light would go on then cut off back and forth. I looked at my gauges and noticed that my oil pressure gauge will be fine then fall then jump back to normal. What do you think?
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When I am idleing it drops , then when I give the gas it jumps back to normal ...... Is an oil pressure switch expensive usually?
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