I kind of understand what you are explaining to me. Those FSA? They all come from the dash right. When you are saying ”constant power”, can I just route one directly from bat positive then?

Really like that diagram that Highgirl posted. Just imagine if it was that easy every time But feels like I actually learn something here. Have a -81, Suzuki GS1000 standing here also. Everything is built up from scratch, to a fresh scrambler....but same story there...all new electrical system(LED, digital), all lying there...since 2 years(ashamed)....

 

No, only one does.
The colors I gave were for the original harness, but assuming you still have some of that left you can use it as a reference when you put any new wires together.
The Green w/red stripe "S" wire comes directly from the ignition switch, so yes it's from the dash.
But the Yellow "A" wire is the voltage sensing wire and should be attached somewhere near the battery. In the factory harness it is spliced into one of the Black power wires somewhere under the harness tape. But you can route it to the battery positive in any way you feel is convenient and reliable.
The Orange "F" wire terminates at the voltage regulator on one end, and the alternator's FLD stud at the other end. No connections with any other circuit. It's the wire that lets the voltage regulator tell the alternator/dynamo how much current it needs to produce.



Yes.
Possible locations are the battery positive directly, or more convenient would be the battery side of the starter relay on the body, or find the original Yellow wire attached to the Black wire and splice it to the original.

The Yellow wire not to be confused with the Yellow wire that powers the horn relay. This horn relay wire is often already there on the big battery stud of the starter relay.
Yellow is an often used color Ford uses to denote a power source. You'll find it at the ignition switch of some vehicles, at the voltage regulator of all Fords, powering the horn relay, and likely a few others. Newer Fords use a Yellow wire with a white tracer/stripe for some applications, but it's still basically Yellow.

Yes it looks pretty straightforward. And since you have the full gauge package on the dash, it's the proper one for you to use.

Paul