Here is my leading contender thus far. They indicate it is available with custom Ohm ranges, so I've asked for price and availability of a unit with a 75-2.5 range.
https://www.hardin-marine.com/p-74416-sfw-fuelwater-level-senders.aspxAnd the signal converter:
https://www.speedwaymotors.com/Classic-Instruments-SN34-Fuel-Link-Interface,230181.html