All pre-2000 TDIs in North America are not OBD2-flashable. They require ECU (engine computer) removal and physical chip swapping.
Click here for the ECU removal and chip installation guide.
99% of North American ECUs (engine computers) already have chip sockets from the factory. That means you do not require ECU soldering. You can order 2 chips from us in mail and then install them in the ECU yourselves. Contact us to arrange this.
Click the following link to see a picture showing where to install chips labeled "H" and "L":
If in the very rare case that your ECU does not have sockets, then you can order our socketing service: Click here for pictures and information.