They aren't all the same. Some amp gauges are better made than others and well away from water damage too. Even though... There can be a totally different design flaw and good reason to bypass the amp gauge or convert the amp gauge to a volts gauge. Such is the case with a-body rallye panel (That conversion is more complicated in some models than others also). No need to get into all of that here. Some owners are willing to live with a in op gauge in their instrument panel while others are not. Good luck to all