You have an early-day (1988) Caspers heated sensor conversion kit on your car. The Bosch sensor used in that kit is a 3 wire heated sensor with the Ford spec. One pin is the signal, the other two pick up heater power from the fan delay relay on the drivers side inner fender. There is a single Weatherpack connector on the kit that also plugs into the harness in the kit - that is the original factory connector for the original one-wire sensor.