I have more of the copper tape on order. Thanks for the link. On my last build, (an offset guitar with Strat electronics). I had just enough of the copper tape to do .25" strips to make continuity with the 2" strips of aluminum tape. I sort of liked the way it looked. Silver with copper spiderweb. Of course no one but me is every likely to see it. To connect the ground to the wiring harness I used an eyelet connector like this:
I pried open the "tube" and flattened out the sides so that they were like wings. I soldered the bridge ground wire to one side, and a wire going to the volume pot to the other. That way if I need to take out the pickguard, I just have one wire to de-solder. With all the jostling a guitar will get, I am not sure I'd trust just taping down a ground wire.
I tested continuity before closing it up. Once closed up, I tested it with one lead on the jack ring, and the other on the strings, the pots, and the pickguard screws that connect the body shielding with the pickguard shielding.
I just checked and eBay here has the same copper shielding tape for a little more than Amazon. Here Amazon is generally faster (though that is no longer always the case), and also often the same or cheaper than eBay for things they sell a lot of. Guitar parts I have generally found cheaper on eBay...particularly if they are better quality.