66 temp sensor wiring

[SS317]

I have looked over a couple different wiring diagrams and looked over the truck. One wiring diagram says green wire, another says a dark green wire. My question is, which firewall connector does the temp sensor wire go through? My engine bay had no wire and I'm trying to wire the bad boy up. I'd like to be able to run my wire to the firewall connector and make the splice there. I tried looking behind the instrument cluster to see if I could just follow it but there is too much old tape around all of the connectors.

If there is a simpler way, please let me know.

Thanks for the help.
Sean