Ammeter bypass turning over alternator

Well Not reading all the BS here is what I know is a fact. The black wire and the red wire that go to the amp meter. I have always connected the two behind the dash when needing the start the car with the cluster out.

That is bypassing the amp gauge and it still charges because the car will run without the battery connected after starting it.

What would be the difference doing it under the hood instead of under the dash. Still a bypass