A voltmeter won’t help there. This is very little voltage across that line. The way the system works the resistance of the sender is what matters. 5V comes from the constant Voltage regulator. It goes to the gauge, then from the gauge to the sender it passes through the sender and grounds through the tank to the body. As the sender moves down the resistance increases reducing the flow through the gauge and the needle falls. If you are getting no movement of the gauge you have a few possibilities.
1. The CVR is bad, but then your temp sender would be dead too.
2. The wiring is bad or loose
3. The sender is bad. As said earlier, if you ground the wire at the sender the gauge should go rapidly to full. Don’t leave it connected as you could damage the gauge
4. The gauge is bad.
Went thru the same thing on my "new" Emberglo 66. I used a jumper wire on the end of the plug that goes on the sending unit and used a test probe for continuity until I figured out there was a break in the wire that was wrapped in the harness as it passed thru the trunk in front of the gas tank. Maybe something heavy mashed it years ago... The CVR voltage pulses so it did me no good to try to use a digital voltmeter, only an old school analog needle sweep voltmeter will bounce accurately with the pulse.
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