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It does sound like it is mis-interpreting the speed signal…

At the back of the speedo:) if a reprogram can fix it Will is your man!

Couldn’t tell you if it will work or not after a reprogram. There were different harnesses and I believe they determine how the controller behaves In different vehicles. You also could be fighting a second problem. Was this an auction truck? Not uncommon to pile all the bad parts on/strip...

So you have a black controller? The A0 used pulse info from the speed sensor same as the speedometer. The newer trucks with the digital/integrated dash generate speed info in the trans controller and distribute it on the data bus. Depending on what controller you are trying in which truck...

It is also dead easy to make a 3 switch controller to still allow you to manually control and check the tire pressure at will from the drivers seat…

What are the tires inflated to when you get the overspeed? Different vehicles used different pressure set controllers. If this controller was for a newer truck, not sure how it gets it’s speed info. Couple of variables that you need the exact controller and sub harness combination to satisfy…