speedo in-op

Ok guys, I have a 93 t/a with a 4l60. I had a obd1 conversion done for tuning purposes.Now the seedo doesnt work. I tried upgrading to a 95 vss. Still doesnt work. What do i need to do for the speedo to read from gear driven to magnetic sensor?????much thanks ahead of time.

p.s. i posted this in drivetrain as well....

any help guys????