Another annoying Alternator question

[seik5]

Thanks that diagram is exactly how my original system was wired. With the upgraded internally regulated 1 wire 100 amp. alternator and gauges I added a 6 gauge power wire back to the battery, So my question is What to do with the original red power wire at the alternator would it hurt to just leave it hooked up? I have removed the plug for the volt reg. And since I have a volt meter in my dash Would I just not use the blue and black in the little plug? I also upgraded the ground but see no reason to not use the old one along with the new one>