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I don't have a parts book Roberto, but I believe that the 'revolution detector' (no, it's not Homeland Security) is the tachometer pick-up which screws into the bellhousing.
As for the 'integration relay', that's a kind of multi-faceted management computer usu. associated to power windows, power doorlocks, airbags, stuff like that. I found a picture of the exact part, posted below:
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