What should I check? Thanks.

 

see pics in this thread http://crx.honda-perf.org/foru...peedo

Find the speedo cable that goes into the tranny near the rear motormount under the air intake arm. Pull the rubber boot back and remove the clip which is in the pics. This clip hold the cable in place. once you remove the clip pull the cable out of the tranny. Then there is a cable inside the speedo cable. Pull it out. Look ay the end opposite the end you pulled out. Has the cable snapped? I had one do that. If it has not then the opposite end of the end you pulled out should have a thin metal square attached to it. If it does then lube it up put it back it and make sure the cable seats in the cluster an make sure the cable is in the tranny. Replace all harware... I had one break on me and I replaced the whole cable assembly.