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I don't see why you couldn't cobble together an adapter from brass flare fittings in the plumbing department of most hardware stores.
I don't think those are unusual threads, but unfortunately I don't have one to check.
Maybe Brnfree or someone that has dealt with it before will see this thread and could tell you what they are.
Those are flare fittings and they will have straight threads. You could go to the autoparts store and get adapters to convert the inverted flare fittings to pipe threads. You could then use regular brass fittings from the hardware store, like a T. Here's a picture of an adapter from OReilly auto parts.
My napa store had all kinds of fittings so I should be able to find something there.
I could not find an inertia switch. I will look again this weekend. The button on my dash goes out to the horn. Your guess is as good as mine on that one. Lol
Thanks again for the help. I will post on saturday if its working or I may need more help. Lol
Below are the two pictures of what might be the relays you mentioned?
