Is the tach wire on 93's in a different spot, or am I missing something? I did a search found everyone saying #13 red connector. But that doesn't seem to match up on my car.

 

I heard the same thing. I wired my tach to the coil. I think it was the black part of the coil.

 

I have mine hooked to the white wire coming from the coil prior to the tach filter (little black box in the wire harness on left side just in front of the valve cover). I am wanting to move mine so that it connects inside the car though. I am just worried the tach filter will screw up my light. The white wire continues into the passenger side of the firewall. If you go that route let me know if it works!