[mickmate]

You need to start with the value of your fuel level gauge. They are usually 33-240 ohm or 0-90 ohm. If you match the sender to that gauge and make sure it is good for the depth of the tank. Another consideration is if you have baffles in the tank and if a float type can be set up to clear it. I like the solid state type senders with no moving parts from companies like Centroid and Isspro.