For your truck or for an engine swap application putting a TBI into something else?
If it's for your truck you'll want to be very specific about the year, engine, and transmission. 1992 w/5.7 and 700R4(4L60, non-E) is what I'm assuming; for best results get a harness from same setup 1991-1992 only. In 1991 the hole in the firewall where the harness passes through changed shape and there's a block attached there where it screws onto the firewall. 1988-1990 are square with a single screw; 1992-up are rectangular with two screws. 1991-1992 would be last 2 years for 700R4/4L60; 1993-1995 would be 4L60E so quite a different harness. There are numerous other differences over the years as well such as the ESC moving into the PCM 1993-up so again stick to 1991-1992 if it's for your 1992 truck. Hope that helps.
Richard