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I'd be tempted to drop the oil and filter anyway to be safe. Give the wiring a quick check by earthing the connector at sensor on a bare bolt, if the light is then steady, you know the wiring up to the dash is good.
The fact it's going off with revs would suggest, to me at least, that is more of a flow problem than a dodgy sensor, because as the engine revs up the pressure would build enough to turn the light off.
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