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Siemens MS43 Retrofit MAP Sensor
From MS4X Wiki
Modern engines are almost exclusively equipped with pressure sensors to measure manifold absolute pressure (MAP).
The M5x engines don't have this sensor, that could be very handy when converting the engine to forced induction, or if you simply want to know MAP.
For those who want to reftrofit a MAP sensor we write this article including a list of parts and tools you need.