Not sure which 2006 Dodge Ram Speedometer Calibrators are right for you? We have over 11133 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Sean C from Milton, VT said, "It takes longer to open up the box and plug in the unit than it does to reprogram the computer. I recalibrated for larger tires last week and everything seems to be working fine. I verified my speedometer with a laser radar and my odometer by comparing it to my wifes car. All is accurate to include my overhead computer. Highly recommended if you install larger tires."