Thank you Michael, Ted, and John!!
Michael, you brought up an interesting point about having the the PSX-1AC after the TIU could degrade the signal. I hadn't thought of it, but it is a good point. I tested with the PSX-1AC removed from the circuit and in the circuit after the TIU as I had wired. I read a signal level of 10 in both situations. I ran an engine again in both situations, and didn't see a difference. However, since my layout is small a difference may not be noticed.
I did some searching for information on the PSX-1AC for both this situation and a description for Rick. Why is it that Google finds the best information for us on none other than the OGR Forum??!! Here is a video that Gary (superwarp1) put on YouTube in 2012 and referred to in this November 2017 topic circuit-breakers-not-tripping-fast-enough. He gives a nice rundown on the PSX and says what Michael referred to about the signal being possibly degraded if it is installed like I did between the TIU and track. I think I will swap the wires around and put the PSX-1ACs between the Z4000 and TIU.
As to the wiring. Thank you for the compliments. I was actually thinking it is kind of messy because I am using up some #12 that is more flexible than the new rolls of #12, both stranded of course. With this small number of feeds on a small layout it isn't a big deal.
As an aside, (if you don't want to read war stories skip to the next paragraph.) The first half of my 43 years working were mostly with a power company in Virginia. I served as an unofficial field engineer for circuit protection and control in the substations. The older panels we had (early 1960's and before) were shear works of art, with all the wires perfectly in order and fanning out in different directions, laced up with waxed string perfectly. By the time I started working in 1976, the electricians were using plastic cable ties, but everything was neat as a pin, perfectly spaced leading to terminal blocks. Occasionally we wired something in or moved something, and I had excellent examples to follow to make things easy. When I started in Telecom in 1997, the wiring and fiber optics were neat in the central offices, but out at customer locations it was a crap shoot. One customer location in the far northern Pittsburgh suburbs was so bad that overloaded wall mounted wire racks had pulled away from the walls and some were laying on the floor. Of course our demarc for the circuit I had to test was in a corner and the customer told me to just tramp on everything to get there!! I was sure I was going to take down his data center!! I found a power strip back there that had power cords for his ethernet switches or routers that were half pulled out!! I was able to get enough slack to push them in tight, and I got my testing done without pulling anything loose to my knowledge. What a nightmare! I was glad to move to network engineering for my last 10 years and not have to delve into literal rats nests any more!
John, I know what you mean about the pandemic messing with us. We are both retired and could help each other now and then, but the way it is right now we are taking the advantage of staying home as much as possible. I would hate to catch it and give it to my high risk wife or my mother-in-law when I drop off groceries of stop in to fix something.