Need help converting to a tach dash

Does any one remember an article in one of the mustang mags about converting from standard to tach dash. I need to locate the under dash wiring, any help. Thanks Bruce

yes I do remember that magazine. I will look as I should have it

Good Day. Mustang Grabber registry has conversion with a wiring diagram. I used their wiring to add headlite relays, it was accurate and very helpfull. Good luck- Dearborn

forgot to mention 1970 Boss registry has instuctions also.