Hi Steven, I am going to use the controller from Sound German Automotive. I've spoken with the owner, Russell, who also developed the controllers. His controller only needs a TPS, brake switch signal, RPM reference - tach signal. The controller otherwise plugs into the transmission, using the built in factory stuff. I am not that aware of the voltages and such, but I am sure Russell will answer your questions. Any questions I've had so far, he's answered them. Here is his website...
Sound German Automotive