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1987-1989 Speed Density Truck
3-wire HEGO (Single)
HEGO SIG at EEC Pin #29
HEGO GND at Sensor body
1990-1995 Speed Density Truck
4-wire HEGO (Single)
HEGO SIG at EEC Pin #29
HEGO GND at EEC Pin #49
1994-1995 5.0L Mass Air Truck
4-wire HEGO (Single)
HEGO SIG at EEC Pin #44
HEGO GND at EEC Pin...