I have a house in Orange County California that was built in the mid 60s and the house has all metal outlet boxes with ground wire attached with metal clips on the front and they had a two prong outlet. I want to convert to 3 prong. I already installed one outlet with a 3 prong and then used my 3 prong outlet tester and it shows that everything is OK and its showing no open ground. Is this acceptable. Or would it be better to take the clip off and attach wire to the recept. Thanks

Wire oulet with pigtail on ground screw and a pigtail from box. Tie to ground wire with wire nut.

Good luck

Chuck