Re: Is AMP gauge going to be dangerous?
The horror stories stem from poor design and bad wiring practices. In actuality, the only current that goes through the meter movement of an ammeter is about one milliamp, the rest is shunted around the meter by a low value resistor, commonly called a shunt. If the shunt is part of the physical meter, you must bring all the measured current to the meter. If you can mount the shunt resistor remotely ( which is what GM did ) you only need bring the small wires and small current to the meter.
An ammeter is not wired to constantly measure all the load of the car, only the system current to and from the battery. You don't normally turn on all the lights, fans, stereo, A/C, etc without the motor running, typically you turn on the ignition and start the car. Once the car is running, all the system current comes from the alternator and does not go through the ammeter shunt. this is why your ammeter reads near zero while you are driving down the road.
"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968