do you really need a turbo timer? this is my opinion, but unless you hammer the crap out of your car every day and switch it off straight away, you dont need it. its a waste of money.
when ur driving home (or to work) just take it easy the last few mins of driving. then dont turn off the engine till you got all your crap out of the car. there, free turbo timer!
plus with todays water cooled turbos, a TT does nothing really