you only need one ignition and that is the red with green stripe, the yellow heaviest gauge wires in the harness is your constant. on your relay satillite harness you will have two red wires, these are your constant inputs be sure to tap only one into each constant ( you will find 4 of them) the only starter wire is the white with pink. horn output is yellow with green in the column, and parking lights is brown at the head light switch. for the door locks, i dont remeber what wires trigger them or if its a 5 wire system or not. you will also need to hook up wires to the cold side of the brake switch, ground, dome light supervison (opt.), trunk release (at switch), and possibly alarm disarm. your hood switch isnt needed for operation, however it may be regulated, if you dont want to use in just connect this wire to ground, or go with the merc switch. for tach. go directly to the tan with yellow right at the coil, there will be two wires that can be used. be sure all underhood connections are soldered and taped or heat shrinked, and make sure all wires are loomed and taped up. all inside connections can be made with scotch locks.