A deadhead regulator doesn't ever stop the flow, but reduces flow to create pressure drop so you're not going to hurt your pump. IMO you can use either a deadhead or bypass regulator, and I've heard some say they simply put a T fitting in the line to the pump as opposed to running a return line to the tank. I like this Holley video for their clear explanations without a bunch of BS - https://www.youtube.com/watch?v=w7rCAreQsto