Almost sounds like the new alternator or regulator is bad...........
What is the voltage doing when the needle is jumping around?
My best guess:
Assuming 66 is wired like a 65 make sure the alternator/car/battery connection is good clean and tight on the back of the starter solenoid.
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65 Bonneville Brougham 4DHT
65 Grand Prix 2DHT......now parts
65 Catalina 2+2 2DHT
65 Catalina Safari 4DSW
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