1994 dodge ram wiring diagram

I need a wring diagram for the tach my guage cluster didnt have a tach so i bought a new cluster with the tach and i was told if i pluged it in it would of worked fine i shouldnt of listened ive been tracing wires for months. im not even positive if the wires are there but if not i need the diagram to see how to hook into the coil and all that ..io would appreciate any feed backthanks jesse