this is the text from my old post. its not hard to do at all.
"I installed the Drag Specialties Tach yesterday. It was easy to install and works great. I wired it up using the factory wires under the dash. There is a 2 wire plug under the dash the red wire is to the coil and the green and red wire is hot with the ignition on. The tach has 4 wires. You wire it Green to the Red coil wire, Black to ground (I used the Brown ground wire for the clock), Red is hot for the tach and Blue it hot for the light I wired them both to the Green/Red hot for the tach."
Tach = Wires under dash
Green = Red
Black = Brown
Red = Green/Red
Blue = Green/Red
I guess you could go Blue to the hot for the light in the clock, but I don't know what the color for that wire is.
