I have not used it, but the instructions are clear about use with resistive senders. Ford's King Seeley gauges don't use resistive senders. That being said, resistive senders are being used with King Seeley gauges. They are just nearly impossible to get them set to get accurate reading across the scale. The site says "can be calibrated at empty, full, and two other points", so "maybe" it can be used, with enough patience, to make the resistive sender more useful with King Seeley gauges. I would call Tanks and ask about my particular situation. If you try it, please give us feedback.
Sorry about any repetitive answer. I'm slower at research and typing.