I've had pretty good results by adding a little more shunt when converting to a higher output alternator than the usual 30-35 amp generator. Putting a loop of stainless steel cut from a radiator hose clamp across the ammeter terminals prevents the needle from pegging out after startup, and there's just enough resistance in the stainless to bleed a little current through the meter movement and make the needle deflect. Accurate- - - -nope- - - -but it prevents damage to the meter movement.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!