feul gauge not working

I have a 1992 civic cx. ibought a gauge cluster from an si and i broke the pointer off the gas guage (putting gauge faces on) before i even put it in so i bought a new feul/heat gauge. now i put it in the other one in and the pointer stayes where it is. I tested for power and there is some and i tested the sensor by grounding out the yellow/red wire to see if the gauge worked and neither seemed to work so i got another one under warranty and put it in and this one doesn't even work.

what can i do?
any help would be appreciated
P.S. The gauge off the old cluster worked.