If your speedo cluster is anything like the 89 Cavalier Z -24 I had -
and the Cimarron is based off a Cavalier platform. It was pretty easy to
remove the cluster.
My 89 had all kinds of visible philips head screws to remove the trim
and dash panels around the cluster. A few screws around the outer
diameter of the cluster held the cluster into the dash.
Pull it forward remove a few wire plug ins. On the 89 cluster a round
spring band held the speedo cable end into the back of the cluster. Once
the cluster is puled forward I think you can squeeze the spring band to
release it. Once the cluster is out of the way you can pull the cable
out & lube it.
Looking at a shop manual would be a good starting point too.