Here's the new fuel gauge circuit. Several resistors are included in that wiring bundle. I left the ends exposed and with actual sockets in case I need to swap the 10 and 100 ohm connections on the relay.
And here's the pile of crap I was left with afterward.
Okay, on to the wiring I employed, and what it does.
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THIS IS ONLY FOR A FIRST GEN NAKED*
Format will be gauge function -> bike function (if different) / gauge wire color -> bike wire color. If two colors it'll be "primary color/stripe"
Ground / Black -> Black/White
Clock Power -> Constant 12V / Brown -> Red
Switch Key -> Switched 12V / Red -> Orange/Green
Fuel Level -> Fuel Level A / Blue -> Red/Black (Keep in mind for the fuel circuit I chose to use the Red/Black wire from the tank)
Left Turn Signal / Orange -> Black
High Beam / Light Green -> Yellow
Caution -> Water Temp Warning / Light Blue -> Black/Green
Neutral / Purple -> Blue/Black
Oil Level Warning / Gray -> Black/Blue
Right Turn Signal / White -> Light Green
I chose to use the stock bike wiring as it seemed to be pretty beefy, and I got rid of most of the original grounds on the main wire anyway. If it seems to be a problem, I'll go directly to the battery.
Anyway, tomorrow I should get the harness and the carbs in the bike, and then I can put all the tail pieces on. I'll finish out the week putting the rear wheel on with the new sprockets and chain!