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I just recently purchased a beautiful 73 240z. It drives wonderfully but the oil pressure gauge has me confused. The car idles at 500rpm and in stop and go traffic when I sit for awhile the oil pressure gauge drops to 0 as soon as I move and the rpm get to 1000+ it returns to normal levels. Is this a gauge thing or should I be alarmed? The temp. never moves above normal regardless of the oil gauge. Thanks for your time, Tod