diagnostic box help
 

so im installing coil on plug system and im trying to get my tach working....i have read that i can install a 1k resister in the diag box between ig- and b+ but here is the problem..
i like a dumbass cut that box out and removed it over a year ago while cleaning up the engine bay. and the fsm dont have detail on what wire goes to witch pin.
so i dont know what wires are what. i do have them all taped off
if someone could tell me what the two wire colors in the box are ig- and b+ i can just solder in a resister between the two.
plesase and thank you