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Why does brown coolant sensor need to be machined?
OBD1 motors already have the correct size hole in the head. Only on OBD2 motors do you have to machine the sensor down, or tap the head larger or use an aftermarket coolant sensor adapter thing.
There should be a second port after that one.
It may not matter which hole, but the factory may have had a good reason to put the Blue plug sensor in the front hole.
Even on older engines, BMW places the blue coolant temp sensor closer to the radiator or upstream of the temp gauge sender.
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