I am the person you emailed you about your cluster for sale. I did not know there was a difference in tach. clusters until today either. I purchased a instrument cluster with tach and other gauges and I went to the local O'Reilly Auto Parts and on their computer system it asks that question. I did not know what they meant byYAZAKI but after looking at my new to me cluster i noticed it written on the back. But it is not working on my truck.