Dead RPM

Hey guys. I know that you guys have talked about this before but I don't see anything that relates to my problem. My RPM needle is not moving period. Turn on the engine and nothing happens. I took out the cluster and checked the connection and everything looks fine. Has this happened to any of you before? any info would be appreciated!!!
Comments
or, a connection is loose in the distributor. i believe thats what the tach is wired too.
SO, either try a different gauge cluster, or check out the connections in your distributor
check if you have power coming from the blue wire.