Boost Tap Line N75?
#2
The computer see's the map pre-TB and models what is post-TB in the intake manifold. The closer you can get to the map sensor the better. If you tee into the boost reference it will show what is at the compressor cover. This is usually higher than what is at the map sensor because of pressure losses between the compressor and TB. You can use a metal valve stem with the core removed as a nipple and this can be installed pre TB close to the y/existing map sensor as possible.
#3
The computer see's the map pre-TB and models what is post-TB in the intake manifold. The closer you can get to the map sensor the better. If you tee into the boost reference it will show what is at the compressor cover. This is usually higher than what is at the map sensor because of pressure losses between the compressor and TB. You can use a metal valve stem with the core removed as a nipple and this can be installed pre TB close to the y/existing map sensor as possible.