SW,
Be careful running your own wire for the alternator. If the gauge cluster you purchased is set up for an AMP meter, the AMP meter may not read properly since the path of the electricity is changed. If you're running a voltmeter, you should be okay.
As far as just hooking up the system the way that it exists, you can use the original harness but be careful to make sure that the primary feed wire is at least 10 gauge, since more than likely, the alternator is 100 amps plus.
Regarding the regulator wires, just cap them and tape them back to the trunk of the harness rather than cutting them out and damaging the harness.
Keep in mind that if the car has a generator light, it will no longer work. The field wire at the regulator is also the ground default on the generator light and since this is a 1 wire alternator and is self-exciting you no longer use the field wire.
Hope this helps. If you need any other assistance, let me know.
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