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i may not be of any help to you, i work on turbo diesel engines. intake manifold pressure, aka boost pressure is usually measured from the intake manifold. now days the cars pcm subtracts absolute manifold pressure to barometric pressure to give you a boost reading.
and the MAP, you are talking about Manifold Absolute Pressure right? are you wanting to run a boost gauge that reads you boost level, or actual manifold pressure? which would be boost pressure plus atmospheric pressure, plus or minus depending on engine load and throttle position.
i like your build, looking good, and tidy
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