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Further to this thread, much to my surprise, I can now say the original fuel sender has started working again!

Two weeks ago, in order to do a short sea trial with the new engine installation, I added 15 gallons of 87 octane gas, with 10% ethanol, plus some Stabil. I trailed the boat about 20 miles to the ramp and back, with about 25 gallons of Stabilized fuel sloshing around in the 40 gallon tank.

Then, returning to the boat this past weekend, the fuel gauge worked when I turned the ignition to "on". I can only figure that the ethanol in the fuel, combined with the agitation, dissolved whatever varnish or other residue, etc was on the sender, and it started working again. Remember the boat had sat with an almost empty fuel tank for 30 years. A benefit of alcohol spiked fuel, I guess!