Well my point was that Lito said they are calibrated differently. If they are interchangeable how can they different? I'm not sure which sensors I have where. I bought a few at a time and changed them out whenever. Can't remember which ones I put where but I use the BBK extensions for all four and I had to cut the tabs off a couple of the connectors. I always assumed the different color connectors and tabs was so you couldn't match them up with the factory harness in the wrong spot.