Well gang, here's the latest....
1. The tank is grounded
2. The gauge is grounded - see note below
3. When grounding out the terminals at the sender, the low fuel wire(white w/stripe) lights up the warning light. The purple wire does nothing
4. A continuity test on the purple wire shows it is not broken.
5. My friend said he grounded out the gauge and there was never any movement of the needle. I told him of the compatibilty issue of gauge and sender, but he said by grounding out the gauge it still should of registered because at that point the sending unit was out of the picture. So his thoughts are that the gauge is bad
6. I have not pulled the sender yet, it's something I hope I wouldn't have to do.
I am going to send this along to EB Spares and see what they think. But if my friend is correct, where can I get a replacement? And if I do, should it be a Jaeger?
Note: Late news!.....
When the black ground wire is disconnected from the gauge, the gauge case still shows a ground. So the gauge is grounding itself internally, hence a bad gauge? Using the wiring diagram that Papajam sent me, it shows that there should be only one ground(black wire)