Syljua, It is my understanding, in later years, MB introduced a "universal" PSE pump for our model of car. Your car's options or features will dictate the number of adapters/hoses you will connect to your PSE pump. I have an older model W140, and as a result, my car uses the connections for the rear parking aids. This option would be capped off for your installation.

As Peter mentioned, P+ is pressure for the lumbar - not vacuum.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML