hey guys im putting a sunpro tach into my 94 blazer has the tbi 4.3 liter. anyway I bought the tach and came with no intructions so im pretty much lost here. I believe I figured out most of how to wire it up except for the green wire off the tach that I belive goes to the negative side of the ignition coil or my distributor... can anybody tell me where this would be and also where do you suggest I put the power wire.. please help with this

 

comon nobdy can help me out here????