Reply to "Upgraded Alt/Old Amp gauge"

Basically the Amp Meter is a useless Instrument that only tells you how much the Alternator is loaded. Wether it is charging your Battery only or supplying current to other stuff also makes no difference. The Amp Meter is blind and can not see where the current is going, but it will show the full load. Apart from that it is compromising your safety by being a potential risk of causing a fire!

I always recommend to get a Volt Meter which is a much more useful Instrument. It tells you the condition of your electrical system. Just join the 2 connectors from the Amp Meter by attaching both of them to the + on a Volt Meter.

As suggested if you use a Shunt as a Jumper between the 2 connectors the only thing that will happen is that your Amp Meter becomes even more useless as it now stops showing the load on the Alternator too.

Btw to answer your question the OE Amp Meter will probably be able to handle your upgraded Alternator on a normal day. Just be aware that because of your upgrade the Alternator has the ability of a much higher output and it can potentially send 100 Amp through the Amp Meter under certain circumstances i.e. if you Battery was completely drained and you switch a lot of stuff on. That could become an issue!