k, I had a 93 Nissan. I traced two wire from some sort of box to the distributor where the plug wires were. It ended up being trial and error. I tried to splice into the first wire, and i pluged every thing up and the tach light up but no movement when I reved the engine. So I tried the other wire (it happened to be Green if that matters) "bingo" , I was up and running. I you have a coil for the distributor search that if you still cant find it.
Best of Luck,
Stroke of Genius