I had to take the dash off so I could work on the whole assembly on the bench and get all the wires to fit inside the stock gauge cups. Here is how I finally organized everything so it would fit. and the back view of the finished product. I saved 5 minutes by not fully reading the instructions for how to set the tach, then wasted a couple hours of rework.  But in the end, goal accomplished... The push-button is for resetting the trip meter.   
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