Ok I bought an Autometer Cobalt Tach w/ external shift light. It has been about 10 yrs. since I have installed one. I know the black wire is the ground, the red wire goes to a 12v source, the green wire goes to the coil, and the white wire goes to a 12 v source for the parking lights. At least that is what I am thinking, like I said it's been awhile. If anybody has any pointers on an easier way to install this, it would be greatly appreciated.. THNX..

yah thats pretty much dead on Eddie. Its a fairly simple install!