I purchased a 85 el Camino some time ago and am getting close to finishing it ,I built a stroke for it with pro billet 2 wire distributor,ignition box and coil I have taken out ac and heater box and replaced it with ac delete panel where I have installed elec fuel pump and fuel pressure reg a 10 screw battery hub,relocated battery into bed coil and ignition box all on delet panel . I have also installed a 3 switch and push button starter panel where radio use to be this car was a stollen vehicle be fore I purchased it at when the motor was taken out of it and ignition wire harness was cut 6 inches from connection sleeve below the brake booster .now it has 2 red 10 or 12 gage wires chat I believe are both positive Leeds ,one 10 gage purple wire that I believe goes to starter one 10 gage pink and small black which I think is ground, small brown ,small dark green ,small tan and a small green white wire my question is, what is the small green white wire for and what wire hooks to tach wire coming from igni box for the near future I am trying to use the stock Gage's that are already in the instrument panel. Any advice would be greatly thankful it