That's true--two wire for the ECM sender and one for the guage. I was thinking Gotbait meant to the left of the 2 contact coolant sensor, and that one is for air, not coolant. It's the one of the three sensors screw into the intake manifold and it is the closest to the throttle body. It has a 2 wire pigtail coming out of it, the coolant sender has a 2-wire plug but no pigtail. The two coolant sensors are easy to find parts, the air sensor isn't.