Fuel Sending Unit Question????!?!?

Hey i have 180 miles on my gas tank, and my gauge is still reading at 2 notches below 3/4 of a tank, is that normal??? seems a little high. and another question is.....when i put the car in park, the gauge fluctuates 3 notches down, then when i start driving again it goes back up to where it was reading before i put it in park.. any help appreaciated.

you may have a faulty fuel level sensor. If there is no issues with the fuel pump, it can be changed independently from the fuel module for much less $$$.