Bypassing the Amp gauge - Question about the MAD Electrical method

Spunk said
Ok so.im attempting to do the mad wiring and I'm just confused because the wiring diagrams that I have doesn't have a wire going to the ignition off of the ammeter
I have a 69 Dodge Dart but the engine is out of a 74 duster so it's a 360.

View attachment 1716427683

Because there isn't a switching wire from the ignition to ammeter. Circuit is constant hot line from battery to alternator.

The main splice on the black wire from alternator to ammeter has the branches to main components