Smokie, is it one with a solid current transformer and not the split version? If so you'll need to either isolate and disconnect the incoming live conductor to slip the CT over the cable or buy a split core transformer (I think they're available seperately on ebay).
Hang on before ordering the other stuff though. I think it's gonna be a PITA if everyone needs to buy stuff they're only likely to use once so I'll do you a deal.
If you act as email and shipping agent, and there aren't too many needed, I'll send you a few boards with headers, level shifter and terminals pre-soldered for you to send to anyone wanting one. Gratis. All you'll need to do is plug in the ESP, wire up the PZEM and 5V supply and mount it in a box.
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PZEMs 
PZEMs 