Amp gauge problem

Well as much as you like and alot of people like to keep things stock those things are a fire hazard and the last thing you want going bad on you while you are on the road in the middle of the night. I would swap it out. But the only other thing that I can think that it would be is if it is doing it while everything is on I.E. headlights heater and so on then the regulator could possibly be bad. I know you replaced it but I have gotten new ones that were worse then the one I took off. I would also chech the connection at the bulk head connector for the mail power feed coming in.