Well if its a 94 engine---the painless system does include a module that allows the fuel pump to run, so the key/body module shouldn't be an issue----I think that to keep things on the same page(colors,etc) I would use a painless harness for the rest of the car. Is it an automatic or stick??? Neutral start switsh, clutch switch make a differance on starting, O2 sensors???? a/c?, electric fan control? electronic auto trans(4/60e) skip shift(6 speed) traction control(corvette) abs??????????

I think you should systematicly go thru it yourself as I have see too many cars arrive for work that someone had skipped something on cause you don't need that---or poorly grounded, too much amperage thru ign switch(instead of using relays)-----