To convert an existing customer to PCMTEC and avoid accidentally licensing the vehicle twice follow these steps.  Perform a read of the customers vehicle and save the file (do not license it) as tuned.tec Return the customers vehicle to stock using the hand controller.  Perform a read of the customers vehicle and save the file (do not license it) as stock.tec Make note of the door tear tag, the tuned (if you didn't tune the vehicle originally, you may not be able to de