Here is a pic of my sensor in a 1990 K2500 with a 5.7. I traced the wire from the driver side cylinder head, up to the front of the motor, joins the rest of the harness, runs down the passenger side of the motor, then goes in with the rest of the harness. I'm almost sure that it goes through the firewall on the passenger side with the main harness. The wire is dark green in color.
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