FlatbedHemi
Senior Member
I bought a Hypertech speedometer calibration unit off eBay that turned out to be VIN locked. I got a refund but was searching for other units and noticed that Rough Country has a unit that is cheaper than the Hypertech. It got me to wondering if there were any other units that work on the 6.4. Anyone have any luck with other units besides the Hypertech for the diesels?