Sending unit not sending...

[qwik1320]

Help!



New gas tank and sending unit installed in my 73 Camaro and I added enough gas to get to station to fill it up, the gauge read "E" but I figured it was because I only put a splash in the tank. Unfortunately now that it's filled (well at least 3/4 full) it's still reading "E"

Here's what I see -
1. there is power at the plug on the rear wiring harness
2. when both the power and ground are connected the gauge reads "E"
3. when only the power is connected (ground disconnected) the gauge reads "E"
4. when I have nothing connected (no power or ground) or just the ground connected the needle goes WAY past "F" to about 3:00

Anyone have any ideas how to fix this???