I may have led you astray, on your car it's I think inside the fuel gauge. See if the fuel gauge has three terminals. One is ignition input, one is the fuel gauge sender, and one is the output of the limiter, which jumpers over to the other gauge(s), temp, and oil, if you have an oil ga.
If you search around, or Redfish may chime in here, there are ways to bypass the original fuel gauge one and incorporate an external "add on" electronic one.
Don't ask why Ma did that--pretty silly if ya as' me