[BrodyP]

1. The four wires from your aftermarket tach are red, green, white, and black.
2. The red, white and black should be easy.
3. The green wire goes to your test tach wire located by your battery. It looks like a coupling just pull it out and the blue wire is exposed use the green line off the tach to that.



Red line > I put to the 3rd fuse in dash
White line > I put to the right headlight fuse under the hood
Black line > To the chassis as close as possible to the tach