Instrument Cluster problem

In my 2003 windstar Instrument Cluster, the rpm/speed/fuel/temp gagues intermittently stop working. All the other lights in the cluster always work. Sometimes the digital odometer goes out too. If I pound on the top of the dash, the gages will sometimes start working. I checked for loose connectors from what I could see by laying on the floor and looking up into the dash. And I removed the small plastic cowal held on by 4 screws just under the steering wheel.

One thing I did notice, I hear a single click sound, just before the gages start working. Sounds maybe like a relay engaging.

Can anyone give me some instructions on how to remove the Instrument Cluster?

Is there a specific connector I should check to see if it's loose?

If it's not a loose connector, is it most likely the cluster or a sending unit?

If it turns out the cluster is broke, there are places on the web that say they can repair it for under $200, should I got that route?

Any other hints.

Thanks.....