I dicsonnected my sending unit on top of the tank and jumpered the terminals on the plug coming from the guage. Then you turn the power on and it should go to Full.. That will tell you that the problem is in the sending Unit in the tank. Sometimes it can be repaired, but most times it takes a new sending unit.....My problem on my 2000 is in the sending Unit, so I haven't taken the time to take it out.....Good project for this winter!!!!!!
The Ohm readings should be 0 to about 15 ohms = Full ...... 89 to about 99 ohms will show empty .....Obviously, the respective levels in the iank will show readings in between....Mine in my 97 Speedster didn't do anything when I slid the float up and down with the sender reconnected, so I had to replace the sending unit with a new one ..That fixed the problem. Somes the float has a leak adn fills up and it can be repaired for a lot less than a new unit !!!!!