After Market Ammeter?

the entire problem with all (at least U.S.) ammeters is that "car makers are cheap." The "full current" Mopars were a problem, and the "improved" external shunt ones, whether GM, Ford, or Mopar were sometimes "numb" meaning, they were way too unresponsive. this is because the manufacturers all did exactly the same thing.........used the actual wiring harness for the shunt for the system. This created an ammeter which could barely "tell" if the headlights were on or off!!