voltage regulators

Hi All, Quick context: I have an '84 RHD Troopy that I love dearly and generally runs like a top. It has two batteries: primary and aux (nothing currently connected to the aux) with an Ironman system to manage between the two. Truck has a dual-fuel system (propane and gas) from a previous life...

Got a '40 with 2 voltage regulators on it. one is for the amp meter, the other is hooked up to a warning light. That does not sound right to me. why is there 2 of them