During the preparation of the boat this year I noticed that the fuel gauge no longer works. After some troubleshooting with a multimeter I found out it was the sensor. I pulled the old one out, measured the depth of the tank, subtracted an inch and ordered the right one for my 80 gallon tank. The new one was installed in minutes. I used my old screws in place of the ones that came with the new transmitter just to make sure they were the right size.