Factory ammeter

Sorry, just skimmed prior posts. If you run a bypass from ALT output to BATT+ as many do, your dash ammeter needle may still move, from the voltage drops in the wiring. All you really care is if the needle moves enough to show "charging" or "discharging". I went further in my 3 1960's Mopars, installing parallel-reversed diodes in series to give ~0.5 V drop at 50 A. I measured that w/ ammeter max'ed in the factory wiring, the voltage drop across the ammeter (and some wiring) is 0.75 V, so my new range is maybe 150 A (diodes are non-linear) which is more than any alternator I will install. Two of mine are 1965, which have dedicated buss-bars in the bulkhead connector so no melted terminals, and I mod'ed my 1964 to that. Search for my post "Modernized Wiring ..." or such from ~10 yrs ago for details, and ignore the fussing from posters who don't understand basic electronics.