...the challenge is hooking up to some kind of gauge that works right...
My '99 Tourer has an LED (bar graph type) display which has a calibration adjustment. It's set up for a 94/0-ohm sender scheme; with the sender out of the tank, you move the float arm between its full and empty points...then adjust the calibration potentiometer so the gauge display tracks the float position.
This setup is more accurate than my I/S's fuel gauge.
Many years ago, MC Enterprises offered a set of bar-mount gauges for the Valkyrie...oil pressure, coolant temp and a voltmeter. I appropriated one of their mounting cups for the fuel gauge. The fuel gauges themselves are readily available on eBay.