Has any one ran a Alternator with a internal voltage regulator?

Hello my name is nathan baluski. i was curious if any one has ran one of those one wire alternator so there is no need for the external voltage regulator. Is it better then factory? Also im having promblems with my whole system my voltage gauge is bouncing like crazy. im never over charging but it bounces between 8 and 13 on the gauge. i think its the alternator but not sure. also it sends the needle on my fuel gauge all funky and idea how i can fix this please help thankyou.
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