Tony, Your King Seally gas tank sending unit does not operate on the Ohms principle and neither does the fuel gauge. Adding a resistor will not solve your problem if you want the gauge to read accurately. This topic has been discussed many, many times. If you do a Fordbarn search on "GAS TANK SENDING UNITS" you will discover tons of pertinent info. to help you solve the problem.
First thing you should do is remove the sending unit and make sure the float is not cracked and full of gas. Secure unit in a vise and then carefully pry off the top of the sender and make sure the contacts are clean and the carbon resistor is properly in place. DO NOT BREAK THAT RESISTOR as no one makes them. Then explore the various remedies found in your SEARCH. Here's what it looks like inside.
Here's one for sale that you could make fit your tank by bending the float arm. Not cheap but ,NOS units are very hard to find.
https://www.ebay.com/itm/NOS-OEM-For...cAAOSwpoxdVxoV