installing a tachometer is very simple even if that magical green wire isn't there all that has to be done is run a wire that is turned on while the car is ON so find a wire in the fuse box or another wire when your key is ON and splice into it then find a ground either metal or a wire make sure to clean the ground last if you don't have a tach and you don't have that wire go to the coil pack under the distrbuter cap and find the NEGATIVE terminal that hooks up to the coil splice into this and cover well with electric tape run it back into the car and hook it up to the sensor wire for the tachometer this is the most important step then you're ready to mount it