ok i have a situation ,,, my gas gauge seems to just change as you drive from 3/4 to 1/2 and then back up as i drive ,,, first thinking hills or things is changing it ,,,, then as i am sitting level it went to 1/4 then to empty,,,, today as i started engine it went to empty, and stand that way while i drove about 40 miles , then it just went to 1/2,, i stop for gas to fill it and see what it would do and i only got 20 gallons in the tank ,,, i have a 75 gallon tank ,,, when i started it it went to full then as i drove it dropped again to 1/2,,, Do you think it is a sensor,, or what else could it be ,,,, it is a 2007 monaco cayman 36 ft A- class
thank you
thank you