Wiring upgrades and ammeter operation

Good morning,
This spring I added 10ga wire from my 60 amp alt. directly to the ammeter through the fire wall, then from the ammeter to the starter relay and a fusable link (common upgrade bypassing the bulkhead connector). So far that seems to be working well as the electric fan and fuel pump have been working fine... shows some charge on the ammeter when everything is running...

I have a 100amp alt. from a police car 360 that i would like to use as i am adding a stereo and larger fuel pump furthur increasing my electrical load.

My thought is to run the recommended 6ga wire directly from the alt. to the starter relay and fusable link while leaving my previous 10ga wire also hooked to the ammeter. My question now is if i add an additional wire that bypasses the ammeter will the meter still show charge/discharge? Sorry for the wordy question but i would like to maintain the original guage operations if possible. I just dont like the idea of a 100amp alt. going through the ammeter only.....

Any thoughts or experience with this would be great.