The factory harness/build has the plug for the blower sensor along side of the engine block, just under the alternator. It has a dumby/protective cover on it from the factory. When the front PTO is added, there is an extension harness from that plug to the sensor. The plug a the end of the extension is the same as that on the factory harness. So, common sense would have the installer moving the dumby plug to the end of the extension harness or placing it in a zip lock bag in the tool box, for the owner. That's what I do.
However, as we have seen time and time again, some of these dealer installers' knuckles drag on the ground when they walk.