There was a short interim period TBM when alternators were first introduced where they kept the centre zero ammeter. As alternator output currents quickly crept up it didn't take long for them to be displaying off the scale charge currents so they were done away with and alternator output then did go direct to be battery.
TBH loosing the ammeter is a blessing electrically (but maybe not for originality) as bad connections to same won't inhibit alternator charge current.
