then we have this ( mainly ) from painless instruction sheet.

where, is clear what instruction says about the orange wire for acc on fusebox... but brown ?

then how is routed the red and black wires. Instruction says RED to hook to batt is the main system power... but black coming from alt ? what is for ?

then... lights red/white... I Guess is feeded from batt or alt.

then... we could break the red wire coming from starter solenoid and fit in the middle the ammeter wiring... but what is the black wire function ? are both linked together inside the fusebox ?

I guess the ign switch red wire is linked to... black or red ( batt or alt )

definitelly break the red line coming from bat and fit in the middle the ammeter will work to make work the ammeter correctly. But would wish to know about the rest.

Maybe I'm oversizing the "problem" BUT when I'm giving advices I like to get in to details and made everything correctly matched.