Okay, heres what I did. I looked at both those links and looked real hard at the block with the built-in proportioning valve and switch included, $119 bucks, a little too much right now. Then since you mentioned NAPA, I gave them a call and they had several switches to choose from so I got the one that has the 1/8th npt threads, $8.95.
Earlier this morning I ordered the Harley T with 4 holes for 11.95 from Drag Specialties. So I figure about $20 bucks and small change vs. $120 for almost the same thing?!? I sure hope I don't wind up needing a prop. valve on this Frakenstein brake setup.....