Wouldnt that be nice. Mine reads about 3 gallons less than i actually have. Filled up at the pump on what i thought was totally empty the other day only to have it fill to 15.4gallons. I really dont need to replace it since i know what's going on, but it would be a cool byproduct.
I would take the plunge and replace it anyway. The original design for the Fuel Sending Unit was a poor one and the replacement that you can purchase has a completely different design (using rocker arms instead of a sensor).
It's nice to have a working gas gauge again! Not critical...but comfortable!
Acetone is one of the best cleaning agents you can find, but I doubt it will help you fuel sensor. From looking at my old unit when I replaced it, the floats seemed to be the issue on mine.
Its been a few years, but if memory serves the replacement unit was about $100? It was one of the first things I replaced when I bought the car. Personally, it is money well spent. Why guess about your fuel level?
phxz31 - SORRY - I completely forgot about this thread. I picked my unit up from courtesynissan.com and it was something like $75 to my door. I was very pleased with the part and I believe it is considered OEM Nissan although I didn't get it from an actual dealer.