Oil pressure sensor light goes on at idle goes off when accelerating

I removed my old sensor and put an oil pressure gauge on. It reads 42 psi at idle and 3 kg/cm2. At 2000 rpm psi is 62 psi and 4.1 kg/cm2. Do I need to replace sensor or what should I do? There does not seem to be an oil pressure problem in fact it seems to be a little high?
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