The Dakota dash pictured in my previous post does work with the 6 speed. If that is the dash you are referring to. The bigger challenge was mounting the clutch pedal and booster. It gets real tight on the pedals area.
I called Dakota Digital today, they said just need a speed signal from the trans. I have a TR6060 out of a '10 Challenger, they do not have a speed sensor in them. A if you buy a 6 speed from Tremec they do have speed sensors. Which do you have?