What is the fascination with the ammeter? Just bypass the POS, run all the stock wire as OEM and install a protected charge wire from alternator to starter relay or sub-bus point.
That is what I was trying to get to. The ampmeter seems to have plenty of range for most, what is the point in putting more shunts on it? Probably would be hard to get it to work properly. A remote shunt under the hood may be a nice idea, but that would involve modifying the stock ampmeter. Seems like a lot of trouble for a uncertain gain.