See Figures 1, 2 and 3
The TFI ignition system was renamed the DI system in 1995 to conform to OBD II naming standards.
The Thick Film Integrated (TFI-IV) and Distributor Ignition (DI) ignition systems feature a universal distributor using no centrifugal or vacuum advance. The distributor has a die cast base which incorporates a hall effect stator assembly. The Ignition Control Module (ICM) can either be mounted on the distributor or be remotely mounted. No distributor calibration is required and initial timing is not a normal adjustment, since timing advance and related functions are controlled by the Powertrain Control Module (PCM).