I installed the speed pulse generator (purchased from WileE) on my 08 TCH last Monday. Works like a charm. I put the switch on the top panel of the storage compartment under the AC controls (make sure you set it back far enough that the flip-up door won't collide with it mid-swing). My tech and I used wire connectors and wire clamps to make the connections. If something goes wrong with the car, I just remove the switch, disconnect the wires, reconnect the speed wire with itself, and pull the SPG out of the car before bringing it into the dealer. They may ask why the speed wire has been cut and reconnected, but I doubt it. And if they do, I can just say I had to pull the radio out to install my Vais SL2i and accidentally cut the wire.

As for the parking brake, Vais told me it would need to be hacked to overcome the lockout for video playing back from the iPod. I haven't upgraded to the SL2vi yet, so I can't tell you. I CAN say it would annoy me to drive around with the parking brake symbol on all the time...