There will be 2 leads, but the third connection is likely to be the sheilding (rather like the outer on a co-axial TV antenae wire) (at least on the crank/rpm/tdc sensor).
FIAT's diagrams do show pinouts -- the MPI Sei (at least, the one with the micro ECU) is identical in most respects (but no canbus). There's a captured copy in the Downloads Library here. Wiring colours are probably/possibly different.
FIAT's diagrams do show pinouts -- the MPI Sei (at least, the one with the micro ECU) is identical in most respects (but no canbus). There's a captured copy in the Downloads Library here. Wiring colours are probably/possibly different.