I recently replaced the primary TPS on my Roadster, I read up on it plus got a lot of help from the captains on this site and really it turned out to be easier than I thought.
I have tunes ECU.
I guess I checked the voltage two or three times after fitting the new one just to be sure.
In the end it was not my problem, I found the two primary wires on the coils were very loose, crimped them to make a tight fit on the coils and all has been well since.