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Location of engine oil sensors and low oil pressure problem

Engine

Vehicle Information: Model: 911S; Year: 1976; Body Type: Coupe; Total Mileage: 100,000;

Dear PCA Tech Help,first, thanks for providing this service; I searched previous posts for the answer to this question, but couldn't find it.Please tell me the locations of the oil press. and temp. senders on my engine. There is a two-wire sender on the outside top corner of the left rear cam chain cover, pointing aft. There's a pair of one-wire sensors on the cam chain housing to the right of the pulley; one looks like a conventional press. switch (like the metal part of a spark plug), points aft, but when I pull the wire (slide terminal connector) the temp gauge goes to zero, so that must be temp sensor (right?). Just above that one, and pointing up, is a cannister-like sensor about 1 1/2 inches diameter, and 1 1/2 inches tall, with a screw terminal on top. Please help identifiy what's what.In addition, when I returned the car to service following winter storage, I found a new problem never before seen (which is why I'm trying to find the pressure sensors). After startup and normal running for 20 min., I saw the green oil pressure light come on at any speed below 2000 rpm, but the oil press. gauge seems to show 15-20 psi down to about 1500 rpm. Press. goes up to 70 or more at higher engine speeds. The only time I ever saw the green light other than engine stopped and ignition on, was in VERY hot weather engine idling after hard running. Is it likely there's a faulty pressure sender for the green light, or worse problems? Ideas on possible causes? Thanks,Ray Rosati

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