Any news on obtaining reliable ammeter?

[Paul from Maine]

When I converted to six volt sealed beam headlights, I replaced my original, perfectly serviceable Ford 20 amp ammeter with a cheap 30 amp one from Tam's because with high beams and brake lights on and the engine off, the needle on the 20 amp would peg on the discharge side! Other than the background behind the needle pivot showing some brass, the cheap 30 amp ammeter has worked flawlessly! I think it even has a Fort script! maybe the 20 amp meters are less robust!