1964 Plymouth Valiant Wiring Harness Build/ Questions

ANOTHER POINT OF CONCERN AND MORE INFORMATION:

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----------------------CURRENT NEW STARTER HARNESS----------------------
-10 gauge red - starter wiring to lower relay ring terminal
-12 gauge brown - smaller starter post to starter relay left side spade terminal


-----------------CURRENT NEW SECONDARY HARNESS-----------------
I was reading the Painless harness instructions and some others that had rewired and were saying to step up the size of the yellow wire from the starter relay to the firewall connector? Is this safe to step up even though the connecting side that continues behind the dash is not the same size? It is a stock OEM size of 16 gauge and I upped it to 12 gauge for that small run. Again let me know. Also also, I need to remake the red/purple, but would this be where I am putting a larger amp fuse?
-12 gauge yellow - starter relay to firewall connector
-12 gauge purple - starter relay to horn bottom
-12 gauge red - starter relay to firewall
-16 gauge black - firewall connector to horn relay top

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OK SO NOW MY MAIN WORRY BEFORE I CONTINUE

I'm seeing people install a fuse for the ammeter (/issue) and I was looking in to what amp fuse to get correct? Again pairing information regarding those that were either running a 10 gauge or upped 8 gauge red wire. I want to say I was seeing information and electric wire gauge charts that people were listing and were saying that if you're running a 10 gauge wire, to run anywhere between a 50-60 amp fuse between the red wire lower ring connector at the starter relay to firewall connector, also listing that if you run a larger 8 gauge wire that you can bump that up to something the likes of a 70-80 amp fuse.

MY WORRY IS even though the wiring I purchased I believed to be a far superior quality than that of a standard gxl automotive wire, I was looking in to the AMPERAGE ratings and was getting worried. Everything I can find lists it as around 30-32 amp current rating based on continuous duty for wires in bundles, harnesses, or conduit at sea level. Some lists I'm seeing is listing this at a max of 23 feet... is this something I should be worried about?

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I look forward to any tips, pointers, or even anybody I should message directly. I'll keep looking in to the electrical sections of the forums in the mean time but please let me know your thoughts on 4 things:

1. The location of where the fuse should go for the ammeter
2. What amp rating fuse should I use
3. Is the 10 gauge red wiring I'm using for the starter harness as well as the small red from starter relay to firewall harness connector going to be ok you think? Any information you can back it up with?
4. Just in general, do these wiring sizes look right? I've done DAYS worth of research and constantly keep checking and exploring new places of information, I'm just again a bit on the spectrum which in turn makes me definitely overthink and over worry but at the same time, I know I get distracted and kinda have to find this happy medium of telling myself it's ok but also telling myself to pay the heck attention.

I think I upgraded the size of the blue coil wire but possibly not I'll have to double check, the yellow wire listed, and I believe that is it. That and sized the brown starter wire to 12 instead of whatever weird maybe 11 gauge possibly not good automotive wire that it was.

-kiyoshi

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