I want to do this so i can use a flash tuner on my car. It is a 1994 mustang GT.
How much work would it be to change the OBDI port in my car to an OBDII port?
can't be done. the computer in your car runs on a different programming language than obdll. what you can do is try and find maybe a different PROM chip for the car.
How much work would it be to change the OBDI port in my car to an OBDII port?
You cant because obd1 %26amp; obd11 are different computer systems . If your tuner is designed for obd11 it wont communicate with an obd1 system .