i have a 92 rs tbi v8 want to make it tpi how do i do it do i have to change computer ,wiring or do i just change tbi to tpi

 

You need the whole TPI assembly, from a boneyard.
You need a TPI fuel pump.

The whole TPI assembly is very important, as there are many stupid little nothings that will add up to more money if you try to part it together. Just get the whole thing out of a wreck or something.

 

try to get a 90+ tpi setup / wiring harness..