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If the truck is running when you do it, yes I think it takes a bit to register.
 

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@KRMO I fill mine with a 2.5 gallon OEM jug when I get down to about 1/2 tank, with my engine off, and never noticed any delay in it showing up as full on the gauge after I check after filling up.
 

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I was down to 1/4 tank of DEF and added 2.5 gallons. That raised it to almost 3/4 tank, which makes sense. Later that afternoon, it dropped to a half a tank. The next few days, it was back at 3/4. After work today it showed it was at 7/8. About every 10 minutes it would drop. Weirdest thing I’ve seen. How can I trust what it really has?!?
 
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