Using Old Ammeter

I'm swapping to a single wire alternator on my slant six and plan on routing the charge wire back to the battery. Old voltage regulator will be gone with this swap.

I'm also moving the original black alternator wire back that runs through the ammeter via the bulkhead to the battery via a fused connection.

Inside my plan was to tie the red and black ammeter leads together and by pass it but I was wondering if I could hook up my ammeter without burning it up? I'm not adding any load to the original wiring within the car.

The new alternator is 75 amp.

My after thought was that since I was re routing the charge circuit directly to the battery, bypassing the stock wiring route, I may be able to do this.

Input?