Great video and I just went through this myself on my Scud. A couple of things to note: I believe when you thought you were up to temperature, it was the water gauge you were looking at (on left). Your oil gauge was only at the first hash after 120 which is right at about 140. Filling up to max level with your car not fully warmed means your oil will expand beyond max and potentially cause other issues. Also, I noted you mention putting 7 quarts in and then running it to temperature. I followed a similar procedure but put about 8 1/4 quarts in and it didn’t even register on the dipstick. Next time I will probably go ahead and put 9 in.
The first thing I would do is verify you have the correct amount of oil in the car. You may have to drain oil and refill to correct amount to verify. If still no oil pressure after starting for a couple seconds turn off immediately. I would then check the oil pressure sending unit connections and possibly replace sending unit itself. Could be many other things causing no oil pressure but this is where I would start at.
