Fuel Gauge

[HANDM]

I've verified that everything is working at the dash by hooking the plug directly to ground, the gauge goes to full and all that.

Once hooked to the tank, nothing.......

Tried the extra ground but am unsure as to where and what I should be grounding from/ to 

[terrible one]

I'd say you've narrowed it down to either the sending unit or the blue wire that goes to the gauge. For checking the ground, just connect a jumper wire from one of the nipples to a clean spot on the chassis. If that doesn't get it, check the blue wire for continuity. If it's good to go, maybe then pull the sending unit and check it out. It could be shot, or it could also be that the float is leaking and has filled with gas, resulting in an empty reading all the time.

[nascarxx29]

If you happen to have a 12 volt testlight light hooked to the blue wire.It will pulsate flash indicating the voltage limiter is working

[A383Wing]

and if it flashes....problem is in the sender...time to pull it out and test it

[HANDM]

Yikes! I'm hoping it's not the sender, it's brand new from napa (if that matters).

Wiring harness is new, I haven't gone beyond straight grounding the senders (oil, gas, temp) and observing the gauges working

Attached a ground wire as described to no effect

Looks like the sender is coming out  of course I just put a bucha gas in