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Well the A1 with the 3126 engine, like all EFI engines has dedicated cam and crank sensors to generate RPM and timing info so the ECU can fire the injectors. That RPM info from the ECU will be available on the data buss, I have seen OBD type tachometers, but not sure what would be required to...

Wire 1444 is the + signal from the sensor, and wire 3083 is the - signal from the magnetic pickup and is tied/referenced to ground at the freq divider connector. At the freq divider, wire 1444 is spliced to wire 1550 for the run over to the center dash Where it is also the + signal. I think...

Yea, don't know about the newer models. The only A1 schematic I have which is labeled vehicle S/N 18550 thru 99999 have that second line running to the polarity protection box. I suspect the load control box uses that signal to control the disconnect relays.

I believe the second terminal on the regulator is a sample of the field current being sent to the field winding. It is used to measure how hard the alternator is working and runs to the STE connector... On a 3116 you can sample a tach signal behind the heater or at the small freq divider box...