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It plugs into a sensor on the cylinder head next to the spark plugs
Yep. Your post doesn’t say what year you’re working on but it looks to me like it’s for the temp sender that’s between cylinders 6 and 8 in an early C3. It senses temp for the (primitive) idle kick for the pollution control system. The connector is “L” shaped with 2 slots for flat spade connectors, right?