The one with the rubber boot is the oil pressure sender's connector; The boot covers the sender. Under the exhaust manifold and up from the oil filter... look for a metal can just small enough to fit in that rubber boot.
The matching pair are for the knock sensors. They're located under the intake manifold, one is between cylinders #5 and #6 (between the starter and the block) and the other is up between cylinders #1 and #2.
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