The diesel fuel indicator first read zero when the tank was full. Then it seemed to have about 7/8 of a tank and the indicator was on about 7 0r 8 out of ten. Then it was reating 6 out of ten when there was only 5 gallons left in a 25 gallon tank. Then after filling up, with 20+ gallons it read 8 out of 10 and now is reading 4 out of ten after running for about one hour. I think I need a new sensor. Does anyone have any other ideas?