The original ElectraWoman was Deidre Hall and DynaGirl was Judy Strangis.

ElectraWoman and DynaGirl aired in 1976 on the Sid and Marty Krofft show in the 1970's on Saturday mornings.
I believe there were only 6-7 episodes. (Maybe not even that many.)
It was cancelled very shortly after it aired. Deidre Hall, now plays "Marlena" on "Days of Our Lives".

However in 2001 The WB channel 11 network is going to revive the series featuring Markie Post in TIGHTS with her costar Anne Stedman who is most famous for her role in Space Cowboys with Clint Eastwood.