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<ol><li><font face="Verdana">The four wires from your aftermarket tach are red, green, white, and black. </font></li><li><font face="Verdana">The red, white and black should be easy. (See below for suggestions) </font></li><li><font face="Verdana">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. </font></li></ol><blockquote dir="ltr" style="MARGIN-RIGHT: 0px"><p><br /><font face="Verdana">These are the wires that the author used.<br />Red line &gt; I put to the 3rd fuse in dash<br />White line &gt; I put to the right headlight fuse under the hood<br />Black line &gt; To the chassis as close as possible to the tach</font></p></blockquote>