Exactley as Matt58 said, it allows you select your frpnt and rear tire pressures, then while filling or deflating, it will honk when you reach that pressure. It became an available option just after my truck was built. I figured I would try adding it and see if it was worth it. Haven't really tried using it yet, so not sure if it is worth while or not.
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The annoying thing about it is that it disables itself everytime the truck is shut off. So when you want to use it you have to go into Settings, enable the feature, then go to Apps and actually open the Tire Fill app.
