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What wire do you have you torque converter switch hooked up to?
The 4 inch elbow you can get from Summit Racing, or airflo.com
I really reccommend the kit from Riff Raff Diesel though, it'll end up being cheaper than making your own with all the shipping and what-not. Just the filter from Napa costs almost as much as his whole kit...
As for the torque converter lock:
The thing to remember is to unlock it at low RPM's (below 1100) and REALLY be sure you unlock it before you stop the truck!!! I don't even touch it in city traffic. Only if I'm cruising on a continuous road where the speed changes a lot or going up a hill.