I have a problem that I having some serious trouble solving.i have a 260z ,1975 year model , i have put in a msd 6al ignition and a master blaster coil three , it is a point distributor .problem is how do i get my tahco meter to work ?can any body give me a wiring diagram for this or one for the actual tahco meter.or just please tell me how to go about this problem. in the back of the tacho, there is a one black one green and one green_white wire that is in a coil loop.please help!!!!!!!!!