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if your car has no factory tach, notice on the edis plug there is one hole that has no wire going to it...if it were there it would be yellow/blue...
that is the tach signal wire...i think the easiest thing is to grab a plug from a wrecking yard (one with a tach wire) and take it apart and remove the tach wire / pin and simply slip it into the plug on your car...done deal ...as you're standing in front of the car it will be the second wire from the left on the edis plug...also the plugs pop apart very easy...ya' don't have to destroy it to get the wire out...you'll have to pierce the silicone membrane on your plug to slide the tach wire/pin into your plug ...hope this helps.
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