Where is the LMM?

I got the Speedbuster BOX (1 poti version) very cheaply today, but I think I'm missing a part of the installation manual. Where should the LMM be? There's a connector behind the air filter that looks like the one in the manual, but on mine, pin 4 is empty and according to the instructions, it should be connected. I don't want to connect anything incorrectly and damage the BOX. Car: Seat Ibiza GT TDi 110 PS, manufactured in 1999, i.e., before the facelift.

[Translating...]kann mir den keiner en tip geben will das ding ja endlich mal testen *gg*

[Translating...]

Zwischen Ansaugrohr zum Turbolader und Luftfilter.

Grüße, Rainer