Basically you have all the electrical components that are for a 2000 car. You are trying to make all these components work with 1998 wiring.
Instead of taking all these electrical components out and switching them of the dash and throughout the car, it is easier to use the same wiring (2000) and just add the connections or modifications necessary to make the BBV functional and relocation of the map sensor. Then by flashing a 2000 gtp file to your 2000 gt pcm, you will have the correct inj. flow rate tables and such to help the car run.
