![]() Note that the jumper goes to the via marked S12 on the top side of the board. (Substitute OPTOIN (Amp pin #30) for DB37 pin 24, and IGN1 (Amp #12) for DB37 pin 36 in the diagram above) The TFI modules are available as Holley 891-105 or Accel 35368 (~$46), as well as from a number of aftermarket sources. The distributor itself uses a Hall effect sensor. ![]() It is about one inch wide, and about four inches long. ![]() The TFI module is a gray box fitted to the side of the distributor. It was used on a number of Ford's engines, the EFI 5.0 engines in particular. Thick Film Ignition (TFI) modules were used on Ford vehicles with distributors from the early 1980s to the mid-1990s.
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