Stepper motor or connection, what do you think?
 

I monitor my fuel level with Torque Pro on my head unit because I have suspected problems with the gauge in my dash cluster before. Well I filled up with gas yesterday and the Torque Pro reads correctly (100% give or take some foe sloshing) but my gauge in my dash cluster has only slowly climbed to about 75% so far. It barely made 50% after an hour of driving yesterday. So what do you guys think my problem is, stepper motor, connection, or something else?

Ready go!!!!
https://cimg2.ibsrv.net/gimg/www.f15...86a8a7645e.jpg


https://cimg0.ibsrv.net/gimg/www.f15...6bafa481a8.gif

My 08 will do that every now and then, but it is too random to worry me right now. However, I had a similar problem in an 05 mustang and it was the stepper motor.