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Can it be only Amiller? I know the answer. The MAP line is a black hose about 1/4" in diameter. It runs from the front of the compressor manifold in the center, to the passenger side behind the HVAC stuff up on a little bracket, where the MAP sensor is. It measures the boost pressure. I'll dig up a pic here.
In this pic you can see it closeup of where it terminates at the manifold. It's the black hose that ends at the far right, bottomish of the pic. I have (in that pic) a X-shaped relief valve which i have no more.
And in this pic you can see the other end. I moved the X farther away from the boost tap where i had it before, and the sensor is just to the right of it, in the center of the pic. It has a little different hose routing in this pic from a stock one.
It is in a black loom it runs from the base of the Y (center of engine behind fuel filter) to the MAP sensor(passenger side on top of the exterior A/C System.