Hey all quick question about an older c-150 im kind of stumped. When i start the engine it goes to the green line quickly. ( normal ) I take off fly around for an hour or so oil temp is halfway again normal. However after I land the psi drops to below green inbetween 25 and 30 hard to tell where exactly. If i rev up the engine it goes into the green at 2200 rpm or so but no where near what it was on initial takeoff. Any ideas??