Ok, so i have a 1995 Dodge half ton 4 wheel drive. When i crank ot cold, the oil pressure shows 40 psi. As it warms up the pressure will drop to between 17 and 20 psi. And the light will flash intermittently. Now, there are no sounds coming from the engine that would indicate the pressure is actually low. But, checking with a mechanical oressure tester shows the pressure to match the gauge reading. I had replaced the sending unit, and no help, ive replaced the oil pump and no change. At this rate im at a loss. The truck runs great, has plenty of power, so i wouldnt think it needs a rebuild. But im at a loss. The truck has 318 magnum in it and im running delo 15w40 with a Wix filter.