OK i know you guys are tired of answering this but I got a 88 bird had v6in it no tach in dash i got the car with no motor . I bought a lt1 with harness and computer and trans do I still need the the stock computer under passenger dash if not what wires do I need to keep not running AC in car n for the driver side wire harness. I know one goes to head lights what do I need to keep on the other one that also has wire that lead in to the firewall just above the bell housing what do I keep need help any info is a plus I am also toggling the fuel pump n what about the speedo new trany has electric

 

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What is toggling the the fuel pump?????,
it runs automatically off the computer or OP switch

 

The lt1 came with engine harness and I will not be running AC so do I need the original computer that is under the dash on passenger side? My fuel pump will be on a toggle switch and there is no tachometer in the car so what wire do I need to use off of the drivers side harness