I know Phillip did some pretty extensive work to get a 120 mph speedo and tach in his gauge cluster. I just want to add a 3 3/8" tach to the blank slot/clock slot on the right hand side. Can anyone (Phillip?) provide me with what all is involved with performing this swap? Are there any idiot lights that need addressed when changing that? Will it screw up the printed circuit? Other than the wires for the tach, do I need to tear apart the harness for any other reason?