I'm not sure if this is any help, but I have a couple of RD04 fuel sensors that I bought for my last Africa Twin. They're used but were sold as working.
The bike got stolen before I got around to fitting them, and the replacement bikes fuel sensors work (or at least one does - haven't emptied the tank far enough to check the second one yet).
I was going to get around to selling them along with a few other bits and pieces soon anyway. I've got into the habit of resetting the odometer when I fill up rather than relying on the lights now, so I doubt they'll ever get fitted even if the current ones break.
If you're interested in them, let me know and I'll try to check that they're working.
I tried doing a quick test with a multimeter but it's difficult to know for sure if they're behaving exactly as they should, but I have a spare battery and bulb somewhere so I should be able to test them with that.
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