John your question is kind of vague, are you referring to the whole unit or just the sensor? The sensor is the little black box on top of the meter. This will have a Ford part # on it. If you remove one from another unit and the parts numbers are the same then it will work. This does not mean the meter will work though. The calibration is achieved by the size of the “air sample tube” size. The sample tube controls how much air is allowed to past over the heated wire. The temperature of the wire changes the resistance, which changes feedback voltage to the EEC. That helps determine injector pulse width. Also the Ford factory injectors are color-coded. The 19’s are orange.