Ok, I may be back in business and think there is an easier way. And it still involves the grey 8 pin socket in the rear. I was looking for more information and stumbled on a web page of a guy down in Texas. The website is here:
https://speckhobbies.com/ols/products/blinker-wiring-kit-redHe is a hobbiest and put together a budget kit to get the rear turn signals working through the grey connector.
His kit also involves a lot of sourcing the OEM stuff on your own such as the OEM turn signal switch, hazard switch, and flasher. He also provided a link at Amazon for wire nut clips to make mounting the flasher unit to firewall. I thought that there would be threaded holes there and found out otherwise. I couldn't figure out how to use bolts and nuts so I zip ties instead. I'm going to pick up the wire nut clips and do it right. [size=78%]
https://www.amazon.com/gp/product/B09RV82B25?ie=UTF8&th=1&linkCode=sl1&tag=bamspeck-20&linkId=c5e1c40ade8c14d8c9d1a5ce48ff1cb4&language=en_US&ref_=as_li_ss_tl[/size]
His kit has a jumper that plugs into a 9 pin socket under the dash. I checked and I do have that. I included a photo of that below. His kit also provides a 8 pin wired connector that plugs in to rear 8 pin socket. By plugging that 9 pin jumper into socket under the dash, it provides feeds for the turn signals in rear grey socket. He also has a custom wiring harness for rear to connect left and right turn signals. Much easier to access than the connectors behind the right quarter panel.
And one thing I really like is that he was able to source LED lights that replace the rear reflectors. I have been searching high and low and had wanted to do something similar. There is some drilling involved for wire holes but it will be hidden. I'm going to reach out to him and see where he found these.
After learning about the 9 pin jumper, I reached back out to Kinnettick about purchasing theirs. I had an opportunity to buy it when I bought the connector with leads but thought it wouldn't be needed. If I had bought it then, it would have been $8. But buying it separately, it was $12. Still pretty reasonable.
If I hadn't started getting many of the extra components on my own already, I would have happily bought the kit from Speck Hobbies for $70. But once I have the jumper, I can run my own rear wiring. I just need the information on where to buy those reflector lights.
I think I'm on the home stretch now!
P.S. In your Street Legal PDF instructions, you mentioned that the socket to plug into the flasher was a grey socket. In my case, it appears that it was a black socket. It was the one long enough to reach the flasher unit. Everything seems to be working correctly up front except for the hyper flashing when using the left or right turn signals. Hazards flash at normal speed. Is that hyper flashing normal?