I need some fuel sending unit experts please

Mattax said

I do not understand how you used the power probe.
Please explain.,

I don't know what digital meter could possibly show as it struggles to display the rapidly changing voltage unless it has a scope function.
It's not really a square wave.
Did you watch the video?

Click to expand...

The power probe shows power or ground. When attached to the sending unit connector it alternately flashes ground / power. Alternating but not consistent tempo. I don’t have an analog voltmeter. But the digital showed voltages alternating somewhere between 12 and zero. I can test again with a resistor.

Wouldn’t the fuel gauge needle moving toward full during the brief grounding show that the fuel gauge is not burned up?