does anyone have the wiring diagram i need to put in an aftermarket tach?

 

You should just go and get a Haynes or Chiltons manual for your car if you plan on doing "do it yourself" stuff. You can pick these up at Autozone, Advance Autoparts, or even Barnes and Nobles. And depending on how all out you are going purchasing an actual Honda shop manual from the dealership is the best nothing is left out. good luck with your tach.