Help with my Gauges!!! Pics
Sorry, couldn't resist.

Seriously, did this happen suddenly while driving, i.e. speedo needle dropped to zero; or began on startup one day? Is the SES light on while the engine is running? Pulling codes is the first place to start if so. You can do that with a paper clip on a 93 (assuming you havent changed the engine/harness/ECM from the stock 93 ones:
http://shbox.com/1/dlc2.jpg
If no SES light, then get a diagram and poke around looking for a chafed wire between the cluster > body harness > junction to the engine harness in the pass. side kick panel.
Long shot, but if you have access to another compatible cluster you can do a swap test (throw a used part at it). Not sure, but I BELIEVE the 93-96 is the same pinout for Z28s. Here's a cluster pinout diagram if that's the case:
http://shbox.com/1/95_z_cluster_pinout.jpg
haha....Gregrob that one is all red so its the performance model overlay and it adds 15hp....the *** model is rainbow colored...lol
Yea I would try another gauge cluster.....Easy enough to swap out and a good starting point
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OP, try to find a functional cluster and swap them to see if your cluster is the issue. It's a good starting point and could save you from countless hours of tearing **** apart and tracing/inspecting wires.


yea nice one. any real help on here???????????????? 





