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Question

Hello !

I have a 2013 Mack Truck . Standard . 
Once I turn the truck ON the letter “I “ appears on the dashboard, but once I start moving the truck it disappears ? 
 

wondering what does “I” stands for ? 
 

when I go over the speed limit , I see 

“ OS” - over the speed limit 

 

 

 

IMG_5700.jpeg

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