My oil pressure is usually a little high at start-up in cool weather, but comes down to the normal range quickly. Last Saturday, it was higher than normal at start-up and did come down to the top of the green after warm-up. But at Mag check (1700) it was too high and I noticed the pressure would follow the rpm but would never fall below 78 or so. My engine is an O-320-D1A with a FP prop. Pressure relief valve? Gauge? Transducer? Thx RC