Tachometer not working.

I have a '97, tach is dead, anyone know where the plug is located?

This from the Crankshaft Position Sensor portion of the Chilton maual:

"If the 24X sensor feed is open, the tachometer on the dash (if vehicle is equipped) will not operate."

I recently replaced the Harmonic Balancer, I must have hit something or disconnected something.