Either MAP sensor will work to give you a reference. The one on top of the engine is a slightly better option IMO. Other than which MAP, you are correct, just go from the MAP adapter to the top of the TiAL. If you are planning to use that adaptor for another boost reference, then you will need to get a "T" so that you can feed both sources from the one reference. Alternatively, like I said, there is a port on the hot pipes, below the MAP sensor on the pipe. You would do the same as what would be done with the MAP adapter.
