Integra oil Light comes on

Got a 91 integra with a B18a 190,000 miles- Runs fines but after running it for a while the oil light comes on and blinks. Won't go off with reving the engine. I replaced the sender- nothing. Oil level is ok, just changed oil and filter. I put a pressure gauge on it and I am getting about 60-70lbs at 3000 rpm. Less at idle. It's getting oil to the top end- took off filler cap and sprays oil all over. If it didn't have pressure it would of locked up by now. I unplugged the sender -nothing. I am going to try to ground the sensor wire. Any ideas?

:frown: