I figured out a part of my confusion re mechanical switch vs hydraulic pressure switch! My toe board is for a 1940 KC (1/2 ton), and my chassis is 1946!
Frankentruck! I looked for the mounting holes in the toe board that came with my project and there were no holes there for mounting of the mechanical switch.
I spent the afternoon at NAPA and have come up with a kluge, that MAY work. (I have attached a photo of the parts mocked up on the workbench.)
Otto, thanks for your suggestion re the order for bleeding the brakes. The reason I was thinking about doing it in the order I mentioned in my post (above) was to move any contaminants as short a distance as possible before they were forced out of the system. I would then go back and bleed the wheel cylinders in your suggested order to get all the air out. Does this seem like a good plan?
(When I was a younger fellow, it seemed to me that all cars had brake light switches like the one shown in the attached photo. When I showed it to the gray-haired guy behind the counter at NAPA this afternoon, he had never seen one before! Maybe I'm older than I want to believe!)
I was hoping to pick up a couple of banjo bolts for the rear wheel cylinders (the ones I have would work, but they look awful) and the soft copper washers that are needed there and a few other places - NAPA didn't have them! Where do folks get new ones? Sources? Part numbers?
Nick 1940 KC Model 1/2 Ton Pickup Project (with '37-'39 Bed and what we think is a '42-'46 Frame) Taos, New Mexico