Tech article:
http://www.pelicanparts.com/techarticles/Mult_pedal_cluster/Mult_pedal_cluster.htm
Great year for a targa! I drove around the first year I owned my car with a shoe lace tied to the gas pedal to pull it up at stop lights as she needed new pedal bushings. Great project and it will make driving a lot more fun. Also, you should buy Wayne's book '101 Projects' and it has details for the pedal bushing project.
http://www.101projects.com/Porsche-101/index.htm