[Sydney]

I have a 240-33 ohm sender. It has 241 ohms at empty. Motorhead is right, your float arm should have an adjustable lenth so you can adjust the radius to be able to get within the 70-10 ohm for the depth of your tank. If I remember right, I think I set mine up so that an empty reading was about an 1 1|2" from the bottom of the tank.