When I click on the link for the system, it leads to an hydraulic system vise the electric version. Do you have another link showing the electric version?If you want to keep it original, Ive seen complete systems for sale on EBay.
Moderator Note: Ebay Link for conversion Kit
I believe the Tbird suppliers sell them as well. Not that difficult to install. If originally is not an issue Borgeson sells a simple kit that attaches to the bottom end of the steering column for a good price.