R.A.C.E. Systems has a data logger for the EEC-VI computer that currently is sold for Mustangs. One could be made to work with the T-bird EEC-VI computer, they just would need the pin-out of the unit. And you would need to be willing to pay the money. Looks like it runs just under $500.00
This data logger is different than some others out there that work. It logs data before it is processed by the engine computer. So you log the same data the engine computer sees in real time. Others read the memory locations after the data is stored in the engine computer.
http://www.racesystems.com/